[ANN] Quil 2.2.2 Release
Happy to announce release of Quil 2.2.2. It is available on clojars: https://clojars.org/quil Here is the list of changes: - Processing.js is shipped in a jar to make it possible to include it using :preamble option to cljsbuild configuration. - Support available-fonts, load-pixels and pixels functions in cljs version. - Fix bug that prevented from using Quil cljs on headless servers. - Fix bugs that prevented Quil from automatically adding canvas to a page if the page is empty. - Documentation fixes. Many thanks to contributors. Happy hacking! Nikita -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Clojure statechart / hierarchical FSM implementation
On Mon, 2014-09-08 at 04:59 +0200, Kevin Lynagh wrote: and Horrocks' excellent Constructing the User Interface with Statecharts (http://www.amazon.com/Constructing-User-Interface-Statecharts-Horrocks/dp/0201342782). If you end up exploring the space and want to discuss design/implementation issues re: statecharts, I'd be happy to discuss off-list. Hi Kevin, Thanks for the links. I'll take a look at those. I'm considering starting off small and seeing what I can do in as functional way as possible. If I make any progress I'll definitely send you an email. Andre Information contained in this e-mail, including attachments and any rights hereto are the property of Portfolio Prospecting and Performance (Pty) Ltd (unless the context clearly indicates otherwise). It is confidential, private and intended for the addressee only and should you not be the addressee and receive it by mistake, kindly notify the sender and delete this information immediately without further disclosure to any other party. Save for bona fide views of Portfolio Prospecting and Performance (Pty) Ltd, views and opinions expressed in this e-mail are those of the sender only. Portfolio Prospecting and Performance (Pty) Ltd accepts no liability whatsoever for any loss or damages incurred, or suffered, arising from the use the information in this e-mail. Portfolio Prospecting and Performance (Pty) Ltd does not warrant the integrity of this e-mail nor that it is free of errors, viruses, interception or interference -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [ANN] Nginx-Clojure v0.2.5 released!
On 08/09/2014 04:20, Xfeep wrote: In addition one Java thread will tie up one native OS thread. A On Monday, September 8, 2014 10:50:13 AM UTC+8, Yuexiang Zhang wrote: Not only Wildfly but also most of mainstream pure java webservers use thread pool to handle http requests. Nginx-Clojure can also be configurated to use thread pool with one or many JVM instances. Advanced Java webservers use Java NIO (I/O multipexing) to do the first phrase (Http request accepting and simple parsing) then run user business flow with thread pool. The first phrase only need one or very few threads. But at the second phrase (using thread pool) largely existing Java Socket API based libraries such as JDBC drivers, Http Client are blocking so if there are many connections they 'll eat up all threads and make the webserver hang because a OS can only support less threads than connections. By the way threads in JVM are not cheap and they use more memory than pure native OS threads and OS threads are pre-emptive and scheduled at constant time slice so if there are too many threads scheduling will cost too many of cpu cycles to do real works. For large scalar application one JVM instance is really not enough. Typical scenario is we use serveral Java webservers such as tomcat, jetty, glassfish etc, and put a reverse proxy such as Nginx, Haproxy, Apache in the front of them. And Nginx-Clojure make this work easier because it can automatic embed JVM instances into Nginx worker processes and we need not maintain too many webservers. Since JDK 5, JVM instances can share Class data to reduce memory usage and the startup time for java applications. And on our enviroment typically we use coroutine based sockets to work with Apache http client , Solr client ,etc. Coroutines are cooperative and cheaper than threads and be created as much as our memory can bear. Xfeep Thanks. Very informative. 'Looks like Nginx-Clojure is a good option. gvim -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Interop nightmare
Not the answer, but might have some useful clues in ... here's a snippet to make a tagger from the Stanford library: (ns processor.tagger (:require [clojure.data.xml :as xml] [clojure.string :as string]) (:import (edu.stanford.nlp.tagger.maxent TaggerConfig MaxentTagger))) ;; Configuration information for the Stanford POS tagger (def conf (TaggerConfig. (into-array [-model resources/models/english-caseless-left3words-distsim.tagger -outputFormat xml -outputFormatOptions lemmatize]))) (def tagger (MaxentTagger. resources/models/english-caseless-left3words-distsim.tagger conf)) Jony -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Does lein midje also run tests written using expectations?
Hello, I am using expectations for writing tests in a code base that already has other tests written using midje. What I observed is that running `lein midje` also runs tests written using expectations. The functions defined in the expectations-options namespace (with meta-data :before-run, :after-run etc.) are also called. While having a single command for running both types of tests would be great, I couldn't find anything mentioned about this in the midje or lein-midje docs nor in the code (although I could be missing it because of my limited understanding of midje's code). Just need to confirm that the behaviour is intentional and not just by chance. Thanks, Vineet -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
ANN: org.clojure/tools.namespace 0.2.6
tools.namespace: parse namespace declarations and reload files in dependency order. https://github.com/clojure/tools.namespace Release 0.2.6 contains the following bugfixes: * `clojure.tools.namespace.parse/read-ns-decl` asserts that its argument is a PushbackReader, instead of silently returning nil * Fix [TNS-22]: broken `clojure.string/replace` with Windows path separator Leiningen dependency information: [org.clojure/tools.namespace 0.2.6] This is a Clojure-contrib project, http://dev.clojure.org/display/doc/Clojure+Contrib -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Does lein midje also run tests written using expectations?
That `lein midje` runs your expectations is just a side effect of expectations' behavior to run its tests on JVM shutdown. Use `(expectations/disable-run-on-shutdown)` to disable that feature. Just need to confirm that the behaviour is intentional and not just by chance. I guess it's a little bit of both ;-) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [ANN] Clojure 1.7.0-alpha2
Hello,
I posted a question about volatiles on the github commit:
https://github.com/clojure/clojure/commit/60440977823752f13a3fec3637538e9a1d68c5d4
I don't know if anybody noticed, so... why is volatile created with
function volatile! and not volatile ? Atoms, refs and agents don't have
exclamation mark in their constructor functions.
Should I think about volatiles as mutable locals? :-)
František
On Friday, September 5, 2014 4:26:53 PM UTC+2, Alex Miller wrote:
Clojure 1.7.0-alpha1 is now available.
Try it via
- Download:
http://central.maven.org/maven2/org/clojure/clojure/1.7.0-alpha2/
- Download securely:
https://repo1.maven.org/maven2/org/clojure/clojure/1.7.0-alpha2/
- Leiningen: [org.clojure/clojure 1.7.0-alpha2]
Highlights below, full change log here:
https://github.com/clojure/clojure/blob/master/changes.md
For users of Clojure 1.7.0-alpha1, there have been a few important changes
in transducers since alpha1:
- Removed flatmap transducer
- Added cat transducer
- mapcat 1-arity is now a transducer, specifically: (comp (map f) cat)
- The completing function has been lifted to be public
Clojure 1.7.0-alpha2 has the changes below from 1.6.0:
## 1 New and Improved Features
### 1.1 Transducers
Transducers is a new way to decouple algorithmic transformations from their
application in different contexts. Transducers are functions that transform
reducing functions to build up a recipe for transformation.
Also see: http://blog.cognitect.com/blog/2014/8/6/transducers-are-coming
Many existing sequence functions now have a new arity (one fewer argument
than before). This arity will return a transducer that represents the same
logic but is independent of lazy sequence processing. Functions included
are:
* conj (conjs to [])
* map
* mapcat
* filter
* remove
* take
* take-while
* drop
* drop-while
* cycle
* take-nth
* replace
* partition-by
* partition-all
* keep
* keep-indexed
Additionally some new transducer functions have been added:
* cat - concatenates the contents of each input
* de-dupe - removes consecutive duplicated values
* random-sample - returns items from coll with random probability
And this function can be used to make completing transforms:
* completing
There are also several new or modified functions that can be used to apply
transducers in different ways:
* sequence - takes a transformation and a coll and produces a lazy seq
* transduce - reduce with a transformation (eager)
* iteration - returns an iterable/seqable/reducible seq of applications of
the transducer to items in coll. Applications are re-performed with every
iterator/seq/reduce.
* run! - run the transformation for side effects on the collection
There have been a number of internal changes to support transducers:
* volatiles - there are a new set of functions (volatile!, vswap!,
vreset!, volatile?) to create and use volatile boxes to hold state in
stateful transducers. Volatiles are faster than atoms but give up atomicity
guarantees so should only be used with thread isolation.
* array iterators - added support for iterators over arrays
Some issues created and addressed during development:
* [CLJ-1511](http://dev.clojure.org/jira/browse/CLJ-1511)
* [CLJ-1497](http://dev.clojure.org/jira/browse/CLJ-1497)
### 1.2 Keyword and Symbol Construction
In response to issues raised in [CLJ-1439](
http://dev.clojure.org/jira/browse/CLJ-1439),
several changes have been made in symbol and keyword construction:
1) The main bottleneck in construction of symbols (which also occurs
inside keywords) was
interning of the name and namespace strings. This interning has been
removed, resulting
in a performance increase.
2) Keywords are cached and keyword construction includes a cache check. A
change was made
to only clear the cache reference queue when there is a cache miss.
### 1.3 Warn on Boxed Math
One source of performance issues is the (unintended) use of arithmetic
operations on
boxed numbers. To make detecting the presence of boxed math easier, a
warning will now
be emitted about boxed math if \*unchecked-math* is enabled.
Example use:
user (defn plus-2 [x] (+ x 2)) ;; no warning, but boxed
#'user/plus-2
user (set! *unchecked-math* true)
true
user (defn plus-2 [x] (+ x 2)) ;; now we see a warning
Boxed math warning, NO_SOURCE_PATH:10:18 - call: public static
java.lang.Number
clojure.lang.Numbers.unchecked_add(java.lang.Object,long).
#'user/plus-2
user (defn plus-2 [^long x] (+ x 2)) ;; use a hint to avoid boxing
#'user/plus-2
* [CLJ-1325](http://dev.clojure.org/jira/browse/CLJ-1325)
### 1.4 update - like update-in for first level
`update` is a new function that is like update-in specifically for
first-level keys:
(update m k f args...)
Example use:
user (update {:a 1} :a inc)
{:a 2}
user (update {:a 1} :a + 2)
{:a 3}
user (update {} :a identity) ;;
Re: tools.analyzer[.js/.jvm], tools.emitter.jvm, status report
Hi Nicola, This is great stuff. Are there plans for a tools.emitter.js? Thanks, Michael -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Does lein midje also run tests written using expectations?
Oh, that explains it. Thanks. - Vineet On Mon, Sep 8, 2014 at 7:13 PM, Tobias Kortkamp tobias.kortk...@gmail.com wrote: That `lein midje` runs your expectations is just a side effect of expectations' behavior to run its tests on JVM shutdown. Use `(expectations/disable-run-on-shutdown)` to disable that feature. Just need to confirm that the behaviour is intentional and not just by chance. I guess it's a little bit of both ;-) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- ~ Vineet -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Books on Functional Algorithms aimed towards undergrad CS?
(First, I should say that I am not an undergrad, haven't been for almost two decades! But in terms of my CS knowledge, that's pretty much where I am.) I recently started reading Sedgewick's Algorithms book (the red one) and am at least making an attempt to follow along with his Coursera course. As someone who has also been trying to learn Clojure, it struck me that it would be great to have a resource/book on functional versions of all the same algorithms. I know there are Clojure implementations of many, if not all, of the algorithms in the book (for example I found an implementation of union-find https://github.com/jordanlewis/data.union-find on github), but it would be nice to have a self-contained functional version of an Algorithms book. I guess my question boils down to this. Is there a functional algorithms book aimed at the beginning/intermediate CS undergraduate curriculum? If not, seems to me that would be a big hole that needs to be filled. -evan -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Interop nightmare
Hey Sam. I too had great difficulty with clojure interop until I became more familiar with Java. I find that it is quite difficult to use clojure unless one knows Java, which I believe to be a barrier to new comers. So I suggest that you learn some Java and start trying to hack simple interop programs to get the hang of it. On Sunday, September 7, 2014 10:50:31 PM UTC-4, Sam Raker wrote: I'm trying to use the Stanford Parser from Clojure, but I don't know hardly any Java, and this is my first time working with the interop stuff. All I want to do is play around with the class in the REPL. I added `[edu.stanford.nlp/stanford-parser 3.4.1]` to my Lein `project.clj`, and the download seemed to go fine. The documentation is http://nlp.stanford.edu/nlp/javadoc/javanlp/edu/stanford/nlp/parser/lexparser/LexicalizedParser.html for those of you playing at home. Basically, my efforts have been a total failure. I can `(import edu.stanford.nlp.parser.lexparser.LexicalizedParser)`, but after that, it's just a nightmare of `no matching ctor`, `no matching field`, `NoSuchFieldException` and `expected static field` errors. I can't even initialize anything -- `(def parser (new LexicalizedParser))` gives me the aforementioned `no matching ctor` error. Like I said before, this is entirely my fault: I don't know Java, I don't know interop, and I Google has failed me. So I turn to you, beloved Clojure community, to correct my ignorance. I'm sure it's not hard, I'm just missing something. Thanks, -sam -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Interop nightmare
This worked for me: http://viewer.gorilla-repl.org/view.html?source=gistid=5baef8ac0f42706e4940filename=parser.clj I had to download the parser distribution from the Stanford NLP site and copy the stanford-parser-3.4.1-models.jar file into the root of my Leiningen project, as I couldn't find it on maven. Hope that helps, Jony -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Interop nightmare
On Sep 8, 2014, at 10:08 AM, Jacob Goodson submissionfight...@gmx.com wrote: Hey Sam. I too had great difficulty with clojure interop until I became more familiar with Java. Yeah, the interop can be painful, especially with the way some Java libraries are designed - and you can end up with some pretty ugly Clojure when dealing with those libraries (still a lot nicer than the Java you'd have to write!). I find that it is quite difficult to use clojure unless one knows Java, which I believe to be a barrier to new comers. I'm surprised every time I hear this. You can write a lot of Clojure without having to do any interop so you can mostly ignore Java altogether unless you specifically want to work with a Java library. Yes, the stacktraces bleed Java but after the initial OMG! shock, they're generally easy to read - they're just LONG and you have to ignore a lot of the irrelevant parts. Leiningen mostly hides the ugly Java ecosystem as regards library management so, again, you can mostly ignore Java there too. Certainly if you're new to Clojure and don't know Java, you want to avoid doing things that require you to interop with Java libraries until you're more comfortable with Clojure itself. So I suggest that you learn some Java and start trying to hack simple interop programs to get the hang of it. Good advice. Practicing with interop on the Java String class or something else that's relatively simple is a nice way to ease into it. Having had to work with Java's JDBC classes, javax.mail, and Java's SOAP implementation - all from Clojure - all I can say is that some Java interop is easier than others, but most of it is somewhat unpleasant :) Sean Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) signature.asc Description: Message signed with OpenPGP using GPGMail
Re: [ANN] Clojure 1.7.0-alpha2
FYI the ticket about volatile is at http://dev.clojure.org/jira/browse/CLJ-1512 and the same question was raised there. On Mon, Sep 8, 2014 at 4:25 PM, Frantisek Sodomka fsodo...@gmail.com wrote: Hello, I posted a question about volatiles on the github commit: https://github.com/clojure/clojure/commit/60440977823752f13a3fec3637538e9a1d68c5d4 I don't know if anybody noticed, so... why is volatile created with function volatile! and not volatile ? Atoms, refs and agents don't have exclamation mark in their constructor functions. Should I think about volatiles as mutable locals? :-) František On Friday, September 5, 2014 4:26:53 PM UTC+2, Alex Miller wrote: Clojure 1.7.0-alpha1 is now available. Try it via - Download: http://central.maven.org/maven2/org/clojure/clojure/1.7.0-alpha2/ - Download securely: https://repo1.maven.org/maven2/org/clojure/clojure/1.7.0-alpha2/ - Leiningen: [org.clojure/clojure 1.7.0-alpha2] Highlights below, full change log here: https://github.com/clojure/clojure/blob/master/changes.md For users of Clojure 1.7.0-alpha1, there have been a few important changes in transducers since alpha1: - Removed flatmap transducer - Added cat transducer - mapcat 1-arity is now a transducer, specifically: (comp (map f) cat) - The completing function has been lifted to be public Clojure 1.7.0-alpha2 has the changes below from 1.6.0: ## 1 New and Improved Features ### 1.1 Transducers Transducers is a new way to decouple algorithmic transformations from their application in different contexts. Transducers are functions that transform reducing functions to build up a recipe for transformation. Also see: http://blog.cognitect.com/blog/2014/8/6/transducers-are-coming Many existing sequence functions now have a new arity (one fewer argument than before). This arity will return a transducer that represents the same logic but is independent of lazy sequence processing. Functions included are: * conj (conjs to []) * map * mapcat * filter * remove * take * take-while * drop * drop-while * cycle * take-nth * replace * partition-by * partition-all * keep * keep-indexed Additionally some new transducer functions have been added: * cat - concatenates the contents of each input * de-dupe - removes consecutive duplicated values * random-sample - returns items from coll with random probability And this function can be used to make completing transforms: * completing There are also several new or modified functions that can be used to apply transducers in different ways: * sequence - takes a transformation and a coll and produces a lazy seq * transduce - reduce with a transformation (eager) * iteration - returns an iterable/seqable/reducible seq of applications of the transducer to items in coll. Applications are re-performed with every iterator/seq/reduce. * run! - run the transformation for side effects on the collection There have been a number of internal changes to support transducers: * volatiles - there are a new set of functions (volatile!, vswap!, vreset!, volatile?) to create and use volatile boxes to hold state in stateful transducers. Volatiles are faster than atoms but give up atomicity guarantees so should only be used with thread isolation. * array iterators - added support for iterators over arrays Some issues created and addressed during development: * [CLJ-1511](http://dev.clojure.org/jira/browse/CLJ-1511) * [CLJ-1497](http://dev.clojure.org/jira/browse/CLJ-1497) ### 1.2 Keyword and Symbol Construction In response to issues raised in [CLJ-1439](http://dev.clojure.org/jira/browse/CLJ-1439), several changes have been made in symbol and keyword construction: 1) The main bottleneck in construction of symbols (which also occurs inside keywords) was interning of the name and namespace strings. This interning has been removed, resulting in a performance increase. 2) Keywords are cached and keyword construction includes a cache check. A change was made to only clear the cache reference queue when there is a cache miss. ### 1.3 Warn on Boxed Math One source of performance issues is the (unintended) use of arithmetic operations on boxed numbers. To make detecting the presence of boxed math easier, a warning will now be emitted about boxed math if \*unchecked-math* is enabled. Example use: user (defn plus-2 [x] (+ x 2)) ;; no warning, but boxed #'user/plus-2 user (set! *unchecked-math* true) true user (defn plus-2 [x] (+ x 2)) ;; now we see a warning Boxed math warning, NO_SOURCE_PATH:10:18 - call: public static java.lang.Number clojure.lang.Numbers.unchecked_add(java.lang.Object,long). #'user/plus-2 user (defn plus-2 [^long x] (+ x 2)) ;; use a hint to avoid boxing #'user/plus-2 * [CLJ-1325](http://dev.clojure.org/jira/browse/CLJ-1325) ### 1.4 update - like update-in for first level `update` is a new function that is like update-in specifically
Re: [ANN] Clojure 1.7.0-alpha2
I asked Rich and he said making a volatile is as dangerous as any ! op. Some people have also asked about vswap! being a macro instead of a method on Volatile. The issue there is that vswap! takes a variadic number of update function args. If implemented as a method, you'd need to provide multiple arities or eventually use apply (like in Atom's swap! https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/Atom.java#L79) - doing it in a macro lets that expansion take place at compile time to provide better performance without the apply. On Mon, Sep 8, 2014 at 1:36 PM, Jozef Wagner jozef.wag...@gmail.com wrote: FYI the ticket about volatile is at http://dev.clojure.org/jira/browse/CLJ-1512 and the same question was raised there. On Mon, Sep 8, 2014 at 4:25 PM, Frantisek Sodomka fsodo...@gmail.com wrote: Hello, I posted a question about volatiles on the github commit: https://github.com/clojure/clojure/commit/60440977823752f13a3fec3637538e9a1d68c5d4 I don't know if anybody noticed, so... why is volatile created with function volatile! and not volatile ? Atoms, refs and agents don't have exclamation mark in their constructor functions. Should I think about volatiles as mutable locals? :-) František On Friday, September 5, 2014 4:26:53 PM UTC+2, Alex Miller wrote: Clojure 1.7.0-alpha1 is now available. Try it via - Download: http://central.maven.org/maven2/org/clojure/clojure/1.7.0-alpha2/ - Download securely: https://repo1.maven.org/maven2/org/clojure/clojure/1.7.0-alpha2/ - Leiningen: [org.clojure/clojure 1.7.0-alpha2] Highlights below, full change log here: https://github.com/clojure/clojure/blob/master/changes.md For users of Clojure 1.7.0-alpha1, there have been a few important changes in transducers since alpha1: - Removed flatmap transducer - Added cat transducer - mapcat 1-arity is now a transducer, specifically: (comp (map f) cat) - The completing function has been lifted to be public Clojure 1.7.0-alpha2 has the changes below from 1.6.0: ## 1 New and Improved Features ### 1.1 Transducers Transducers is a new way to decouple algorithmic transformations from their application in different contexts. Transducers are functions that transform reducing functions to build up a recipe for transformation. Also see: http://blog.cognitect.com/blog/2014/8/6/transducers-are-coming Many existing sequence functions now have a new arity (one fewer argument than before). This arity will return a transducer that represents the same logic but is independent of lazy sequence processing. Functions included are: * conj (conjs to []) * map * mapcat * filter * remove * take * take-while * drop * drop-while * cycle * take-nth * replace * partition-by * partition-all * keep * keep-indexed Additionally some new transducer functions have been added: * cat - concatenates the contents of each input * de-dupe - removes consecutive duplicated values * random-sample - returns items from coll with random probability And this function can be used to make completing transforms: * completing There are also several new or modified functions that can be used to apply transducers in different ways: * sequence - takes a transformation and a coll and produces a lazy seq * transduce - reduce with a transformation (eager) * iteration - returns an iterable/seqable/reducible seq of applications of the transducer to items in coll. Applications are re-performed with every iterator/seq/reduce. * run! - run the transformation for side effects on the collection There have been a number of internal changes to support transducers: * volatiles - there are a new set of functions (volatile!, vswap!, vreset!, volatile?) to create and use volatile boxes to hold state in stateful transducers. Volatiles are faster than atoms but give up atomicity guarantees so should only be used with thread isolation. * array iterators - added support for iterators over arrays Some issues created and addressed during development: * [CLJ-1511](http://dev.clojure.org/jira/browse/CLJ-1511) * [CLJ-1497](http://dev.clojure.org/jira/browse/CLJ-1497) ### 1.2 Keyword and Symbol Construction In response to issues raised in [CLJ-1439](http://dev.clojure.org/jira/browse/CLJ-1439), several changes have been made in symbol and keyword construction: 1) The main bottleneck in construction of symbols (which also occurs inside keywords) was interning of the name and namespace strings. This interning has been removed, resulting in a performance increase. 2) Keywords are cached and keyword construction includes a cache check. A change was made to only clear the cache reference queue when there is a cache miss. ### 1.3 Warn on Boxed Math One source of performance issues is the (unintended) use of arithmetic operations
Re: [ANN] Clojure 1.7.0-alpha2
+1 for the ! No atomic changes here, no coordination whatsoever. At the mercy of the caller... I asked Rich and he said making a volatile is as dangerous as any ! op. Some people have also asked about vswap! being a macro instead of a method on Volatile. The issue there is that vswap! takes a variadic number of update function args. If implemented as a method, you'd need to provide multiple arities or eventually use apply (like in Atom's swap! https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/Atom.java#L79) - doing it in a macro lets that expansion take place at compile time to provide better performance without the apply. On Mon, Sep 8, 2014 at 1:36 PM, Jozef Wagner jozef.wag...@gmail.com wrote: FYI the ticket about volatile is at http://dev.clojure.org/jira/browse/CLJ-1512 and the same question was raised there. On Mon, Sep 8, 2014 at 4:25 PM, Frantisek Sodomka fsodo...@gmail.com wrote: Hello, I posted a question about volatiles on the github commit: https://github.com/clojure/clojure/commit/60440977823752f13a3fec3637538e9a1d68c5d4 I don't know if anybody noticed, so... why is volatile created with function volatile! and not volatile ? Atoms, refs and agents don't have exclamation mark in their constructor functions. Should I think about volatiles as mutable locals? :-) František On Friday, September 5, 2014 4:26:53 PM UTC+2, Alex Miller wrote: Clojure 1.7.0-alpha1 is now available. Try it via - Download: http://central.maven.org/maven2/org/clojure/clojure/1.7.0-alpha2/ - Download securely: https://repo1.maven.org/maven2/org/clojure/clojure/1.7.0-alpha2/ - Leiningen: [org.clojure/clojure 1.7.0-alpha2] Highlights below, full change log here: https://github.com/clojure/clojure/blob/master/changes.md For users of Clojure 1.7.0-alpha1, there have been a few important changes in transducers since alpha1: - Removed flatmap transducer - Added cat transducer - mapcat 1-arity is now a transducer, specifically: (comp (map f) cat) - The completing function has been lifted to be public Clojure 1.7.0-alpha2 has the changes below from 1.6.0: ## 1 New and Improved Features ### 1.1 Transducers Transducers is a new way to decouple algorithmic transformations from their application in different contexts. Transducers are functions that transform reducing functions to build up a recipe for transformation. Also see: http://blog.cognitect.com/blog/2014/8/6/transducers-are-coming Many existing sequence functions now have a new arity (one fewer argument than before). This arity will return a transducer that represents the same logic but is independent of lazy sequence processing. Functions included are: * conj (conjs to []) * map * mapcat * filter * remove * take * take-while * drop * drop-while * cycle * take-nth * replace * partition-by * partition-all * keep * keep-indexed Additionally some new transducer functions have been added: * cat - concatenates the contents of each input * de-dupe - removes consecutive duplicated values * random-sample - returns items from coll with random probability And this function can be used to make completing transforms: * completing There are also several new or modified functions that can be used to apply transducers in different ways: * sequence - takes a transformation and a coll and produces a lazy seq * transduce - reduce with a transformation (eager) * iteration - returns an iterable/seqable/reducible seq of applications of the transducer to items in coll. Applications are re-performed with every iterator/seq/reduce. * run! - run the transformation for side effects on the collection There have been a number of internal changes to support transducers: * volatiles - there are a new set of functions (volatile!, vswap!, vreset!, volatile?) to create and use volatile boxes to hold state in stateful transducers. Volatiles are faster than atoms but give up atomicity guarantees so should only be used with thread isolation. * array iterators - added support for iterators over arrays Some issues created and addressed during development: * [CLJ-1511](http://dev.clojure.org/jira/browse/CLJ-1511) * [CLJ-1497](http://dev.clojure.org/jira/browse/CLJ-1497) ### 1.2 Keyword and Symbol Construction In response to issues raised in [CLJ-1439](http://dev.clojure.org/jira/browse/CLJ-1439), several changes have been made in symbol and keyword construction: 1) The main bottleneck in construction of symbols (which also occurs inside keywords) was interning of the name and namespace strings. This interning has been removed, resulting in a performance increase. 2) Keywords are cached and keyword
Re: Books on Functional Algorithms aimed towards undergrad CS?
Shameless plug (and not really answering the question): I've created a version of union-find, inspired by the mentioned library, but using the vocabulary of the course, pure datastructures (and a harmless volatile to transparently implement path reduction). I've also tried to document the readme as clearly as possible: https://github.com/laurentpetit/union-find/blob/master/README.md Le lundi 8 septembre 2014, Evan Zamir zamir.e...@gmail.com a écrit : (First, I should say that I am not an undergrad, haven't been for almost two decades! But in terms of my CS knowledge, that's pretty much where I am.) I recently started reading Sedgewick's Algorithms book (the red one) and am at least making an attempt to follow along with his Coursera course. As someone who has also been trying to learn Clojure, it struck me that it would be great to have a resource/book on functional versions of all the same algorithms. I know there are Clojure implementations of many, if not all, of the algorithms in the book (for example I found an implementation of union-find https://github.com/jordanlewis/data.union-find on github), but it would be nice to have a self-contained functional version of an Algorithms book. I guess my question boils down to this. Is there a functional algorithms book aimed at the beginning/intermediate CS undergraduate curriculum? If not, seems to me that would be a big hole that needs to be filled. -evan -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com javascript:_e(%7B%7D,'cvml','clojure@googlegroups.com'); Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com javascript:_e(%7B%7D,'cvml','clojure%2bunsubscr...@googlegroups.com'); For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com javascript:_e(%7B%7D,'cvml','clojure%2bunsubscr...@googlegroups.com');. For more options, visit https://groups.google.com/d/optout. -- Laurent Petit -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Interop nightmare
On Monday, September 8, 2014 11:09:50 AM UTC-7, Sean Corfield wrote: I find that it is quite difficult to use clojure unless one knows Java, which I believe to be a barrier to new comers. I'm surprised every time I hear this. You can write a lot of Clojure without having to do any interop so you can mostly ignore Java altogether unless you specifically want to work with a Java library. Yes, the stacktraces bleed Java but after the initial OMG! shock, they're generally easy to read - they're just LONG and you have to ignore a lot of the irrelevant parts. Leiningen mostly hides the ugly Java ecosystem as regards library management so, again, you can mostly ignore Java there too. Coming to clojure with no java experience is pretty brutal, in my experience. You absolutely can't ignore the Java, because of the embrace-the-platform architecture. I suspect this difficulty is surprising to java developers because it's so easy to forget how much one has learned. An error message like no matching ctor is very confusing without Java experience. It takes only a few minutes on google to sort this out, but there are at least hundreds of details like this that bleed through from Java. It adds up quickly. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Books on Functional Algorithms aimed towards undergrad CS?
Thanks I'll check it out! Is your sense that there really isn't a book that fits this target right now? On Monday, September 8, 2014 12:45:46 PM UTC-7, Laurent PETIT wrote: Shameless plug (and not really answering the question): I've created a version of union-find, inspired by the mentioned library, but using the vocabulary of the course, pure datastructures (and a harmless volatile to transparently implement path reduction). I've also tried to document the readme as clearly as possible: https://github.com/laurentpetit/union-find/blob/master/README.md Le lundi 8 septembre 2014, Evan Zamir zamir...@gmail.com javascript: a écrit : (First, I should say that I am not an undergrad, haven't been for almost two decades! But in terms of my CS knowledge, that's pretty much where I am.) I recently started reading Sedgewick's Algorithms book (the red one) and am at least making an attempt to follow along with his Coursera course. As someone who has also been trying to learn Clojure, it struck me that it would be great to have a resource/book on functional versions of all the same algorithms. I know there are Clojure implementations of many, if not all, of the algorithms in the book (for example I found an implementation of union-find https://github.com/jordanlewis/data.union-find on github), but it would be nice to have a self-contained functional version of an Algorithms book. I guess my question boils down to this. Is there a functional algorithms book aimed at the beginning/intermediate CS undergraduate curriculum? If not, seems to me that would be a big hole that needs to be filled. -evan -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- Laurent Petit -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Books on Functional Algorithms aimed towards undergrad CS?
There is the classic Purely Functional datastructures by Okasaki. I haven't read it, the examples are in standard ML if I remember correctly. CTM, Concepts Techniques and Models of Computer Programming, develops datastructures and algorithms above a functional core. I haven't read it front to end to know if it presents algorithms, but I know it covers all major paradigms, concepts of virtual machines, threads, memory consumption and management, garbage collection, etc. I've followed the Course on edx.com by Peter Van Roy and had a lot of fun (yeah, really). Coming from Clojure, I felt at home with the functional paradigm presented, and could focus on the big picture that was presented there. Then lots of books will, I guess, present versions of algorithms in impure / imperative forms. It was quite interesting to see how to tweak the original union-find algorithm to use pre-existing clojure datastructures. My guess is that generally you'll have to use maps instead of arrays (in the case of union-find, it then creates a less optimized algorithms, but a more generic one where keys/site can be any value, not just array indices). And then see when you can replace index-based algorithms with reduce/fold applications. I would be happy to learn about such books 2014-09-08 22:14 GMT+02:00 Evan Zamir zamir.e...@gmail.com: Thanks I'll check it out! Is your sense that there really isn't a book that fits this target right now? On Monday, September 8, 2014 12:45:46 PM UTC-7, Laurent PETIT wrote: Shameless plug (and not really answering the question): I've created a version of union-find, inspired by the mentioned library, but using the vocabulary of the course, pure datastructures (and a harmless volatile to transparently implement path reduction). I've also tried to document the readme as clearly as possible: https://github.com/laurentpetit/union-find/blob/master/README.md Le lundi 8 septembre 2014, Evan Zamir zamir...@gmail.com a écrit : (First, I should say that I am not an undergrad, haven't been for almost two decades! But in terms of my CS knowledge, that's pretty much where I am.) I recently started reading Sedgewick's Algorithms book (the red one) and am at least making an attempt to follow along with his Coursera course. As someone who has also been trying to learn Clojure, it struck me that it would be great to have a resource/book on functional versions of all the same algorithms. I know there are Clojure implementations of many, if not all, of the algorithms in the book (for example I found an implementation of union-find https://github.com/jordanlewis/data.union-find on github), but it would be nice to have a self-contained functional version of an Algorithms book. I guess my question boils down to this. Is there a functional algorithms book aimed at the beginning/intermediate CS undergraduate curriculum? If not, seems to me that would be a big hole that needs to be filled. -evan -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- Laurent Petit -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- Laurent Petit -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it,
Re: Interop nightmare
For an enterprising clojure hacker, this is a good opportunity to write Clojure for non-Java Hackers and put it up on Pragprog. On Sunday, September 7, 2014 10:50:31 PM UTC-4, Sam Raker wrote: I'm trying to use the Stanford Parser from Clojure, but I don't know hardly any Java, and this is my first time working with the interop stuff. All I want to do is play around with the class in the REPL. I added `[edu.stanford.nlp/stanford-parser 3.4.1]` to my Lein `project.clj`, and the download seemed to go fine. The documentation is http://nlp.stanford.edu/nlp/javadoc/javanlp/edu/stanford/nlp/parser/lexparser/LexicalizedParser.html for those of you playing at home. Basically, my efforts have been a total failure. I can `(import edu.stanford.nlp.parser.lexparser.LexicalizedParser)`, but after that, it's just a nightmare of `no matching ctor`, `no matching field`, `NoSuchFieldException` and `expected static field` errors. I can't even initialize anything -- `(def parser (new LexicalizedParser))` gives me the aforementioned `no matching ctor` error. Like I said before, this is entirely my fault: I don't know Java, I don't know interop, and I Google has failed me. So I turn to you, beloved Clojure community, to correct my ignorance. I'm sure it's not hard, I'm just missing something. Thanks, -sam -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Books on Functional Algorithms aimed towards undergrad CS?
On Mon, Sep 8, 2014, at 10:04 AM, Evan Zamir wrote: (First, I should say that I am not an undergrad, haven't been for almost two decades! But in terms of my CS knowledge, that's pretty much where I am.) I recently started reading Sedgewick's Algorithms book (the red one) and am at least making an attempt to follow along with his Coursera course. As someone who has also been trying to learn Clojure, it struck me that it would be great to have a resource/book on functional versions of all the same algorithms. I know there are Clojure implementations of many, if not all, of the algorithms in the book (for example I found an [1]implementation of union-find on github), but it would be nice to have a self-contained functional version of an Algorithms book. I guess my question boils down to this. Is there a functional algorithms book aimed at the beginning/intermediate CS undergraduate curriculum? If not, seems to me that would be a big hole that needs to be filled. -evan It's not quite what you're looking for, but Osaki's Purely Functional Data Structures might be of interest to you. It obviously covers data structures, but also operations on the data structures. --Chris References 1. https://github.com/jordanlewis/data.union-find -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Interop nightmare
On 9 September 2014 at 00:33:11, Ivan L (ivan.laza...@gmail.com) wrote: For an enterprising clojure hacker, this is a good opportunity to write Clojure for non-Java Hackers and put it up on Pragprog. Sounds more like Just enough Java for Clojure. Which I think would have too small an audience to be worth the effort. -- @michaelklishin, github.com/michaelklishin -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Books on Functional Algorithms aimed towards undergrad CS?
Thanks, Chris. I actually have Okasaki's book and thought to mention it in the post as an example of a book that is too advanced for me. Not to mention, it's in ML. I'm sure it's a great book, and I could try to slog through it, but it would be great to have a more introductory level book on algorithms from a functional perspective. On Monday, September 8, 2014 1:38:28 PM UTC-7, Chris Sims wrote: On Mon, Sep 8, 2014, at 10:04 AM, Evan Zamir wrote: (First, I should say that I am not an undergrad, haven't been for almost two decades! But in terms of my CS knowledge, that's pretty much where I am.) I recently started reading Sedgewick's Algorithms book (the red one) and am at least making an attempt to follow along with his Coursera course. As someone who has also been trying to learn Clojure, it struck me that it would be great to have a resource/book on functional versions of all the same algorithms. I know there are Clojure implementations of many, if not all, of the algorithms in the book (for example I found an implementation of union-find https://github.com/jordanlewis/data.union-find on github), but it would be nice to have a self-contained functional version of an Algorithms book. I guess my question boils down to this. Is there a functional algorithms book aimed at the beginning/intermediate CS undergraduate curriculum? If not, seems to me that would be a big hole that needs to be filled. -evan It's not quite what you're looking for, but Osaki's Purely Functional Data Structures might be of interest to you. It obviously covers data structures, but also operations on the data structures. --Chris -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: can't connect with Datomic transactor
Wilker,
It seems that you haven't actually started the transactor. For developing,
I'd recommend using lein-datomic
https://github.com/johnwayner/lein-datomic.
Hope that helps,
-Josh
On Sunday, September 7, 2014 8:06:55 PM UTC-7, Wilker wrote:
Hi,
I was using Datomic in memory for a few days, and now I tried to switch
for a more persistent storage. First I tried just using the free, but I was
getting this error:
CompilerException java.lang.NoSuchMethodError:
clojure.lang.SeqIterator.init(Lclojure/lang/ISeq;)V,
compiling:(form-init5913779045640355531.clj:1:11)
Then I tried to use pro to see if that works, but end up with same results.
The funny part is, if I try to connect just after launching the transactor
I get this:
(def conn (d/connect uri))
CompilerException clojure.lang.ExceptionInfo: Error communicating with
HOST localhost on PORT 4334 {:alt-host nil, :peer-version 2, :password
..., :username ..., :port 4334, :host localhost, :version 0.9.4894,
:timestamp 1410145249419, :encrypt-channel true},
compiling:(form-init5913779045640355531.clj:1:11)
Then if I run same thing again:
(def conn (d/connect uri))
CompilerException java.lang.NoSuchMethodError:
clojure.lang.SeqIterator.init(Lclojure/lang/ISeq;)V,
compiling:(form-init5913779045640355531.clj:1:11)
Running (d/create-database) works just fine (I can confirm by checking on
the console).
All that I get from datomic transactor log is this:
2014-09-08 00:05:24.455 INFO defaultdatomic.lifecycle - {:tid 26,
:pid 58071, :host localhost, :port 4334, :encrypt-channel true, :version
0.9.4894, :timestamp 1410145524454, :event :transactor/heartbeat, :rev
198}
I have no more idea about what to do to fix it... You guys know what this
issue is about?
Thanks.
---
Wilker Lúcio
http://about.me/wilkerlucio/bio
Woboinc Consultant
+55 81 82556600
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Re: Interop nightmare
Thanks for all the help! I knew I could count on you guys. I saw that there were a bunch of params in the constructor, but naively hoped there'd be some kind of default values for them so I didn't have to muck around with anything too much. Disappointed once again. I'll look into exactly what else I have to move around/import/instantiate before I can get the parser to just work. As for the comments about Clojure being difficult to use w/o knowing Java, aside from this unfortunate experience, I've found it pretty easy/not an issue. The automatic upgrading of integers to the appropriate underlying Java (/JVM) types, and the wrappers around Java's regex stuff are two good examples. I'd imagine it'd be much more difficult coming in cold, although TJOC and the other intro to Clojure book I read at least covered numerics and over/underflow pretty thoroughly. The other stuff (typed arrays, e.g.) keep out of your way unless you actively seek them out, so it's not a big deal either. That being said, while Just enough Java for Clojure, as Ivan and Michael discussed, might not be big enough on its own for a book/article, I, for one, would appreciate more on interop than I've seen, which tends to be along the lines of use ClassName/staticThing for static things, use . for everything else, also .. and doto exist. On Monday, September 8, 2014 4:49:12 PM UTC-4, Michael Klishin wrote: On 9 September 2014 at 00:33:11, Ivan L (ivan.l...@gmail.com javascript:) wrote: For an enterprising clojure hacker, this is a good opportunity to write Clojure for non-Java Hackers and put it up on Pragprog. Sounds more like Just enough Java for Clojure. Which I think would have too small an audience to be worth the effort. -- @michaelklishin, github.com/michaelklishin -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Clojure + Vert.x + LightTable
Hey Sorry for this noob question, but is there any way to start vert.x project for level of LT? I have created vert.x project with lein new vertx and it works perfectly well from the level of command line, light table screams with: java.io.FileNotFoundException: Could not locate vertx/core__init.class or vertx/core.clj on classpath Any hint? Paweł -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Books on Functional Algorithms aimed towards undergrad CS?
Although it's not specifically an algorithms book, the book How to Design Programs covers a number of important classes of algorithms (sorting, graph searches, etc.), and more importantly, teaches you how to reason about them and how to come up with them yourself. Another great resource is programmingpraxis.com. If you work through a significant number of those exercises, you'll gain significant algorithm expertise. All the exercises are accompanied by a Scheme solution, which should be easy to port to Clojure. Also worth mentioning is a very hard book (harder than Okasaki) called Pearls of Functional Programming (code is in Haskell). You can learn a lot by taking any typical algorithms book and try converting the algorithms to Clojure. Ask here if you run into problems. On Mon, Sep 8, 2014 at 2:09 PM, Evan Zamir zamir.e...@gmail.com wrote: Thanks, Chris. I actually have Okasaki's book and thought to mention it in the post as an example of a book that is too advanced for me. Not to mention, it's in ML. I'm sure it's a great book, and I could try to slog through it, but it would be great to have a more introductory level book on algorithms from a functional perspective. On Monday, September 8, 2014 1:38:28 PM UTC-7, Chris Sims wrote: On Mon, Sep 8, 2014, at 10:04 AM, Evan Zamir wrote: (First, I should say that I am not an undergrad, haven't been for almost two decades! But in terms of my CS knowledge, that's pretty much where I am.) I recently started reading Sedgewick's Algorithms book (the red one) and am at least making an attempt to follow along with his Coursera course. As someone who has also been trying to learn Clojure, it struck me that it would be great to have a resource/book on functional versions of all the same algorithms. I know there are Clojure implementations of many, if not all, of the algorithms in the book (for example I found an implementation of union-find https://github.com/jordanlewis/data.union-find on github), but it would be nice to have a self-contained functional version of an Algorithms book. I guess my question boils down to this. Is there a functional algorithms book aimed at the beginning/intermediate CS undergraduate curriculum? If not, seems to me that would be a big hole that needs to be filled. -evan It's not quite what you're looking for, but Osaki's Purely Functional Data Structures might be of interest to you. It obviously covers data structures, but also operations on the data structures. --Chris -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Warnings as errors
Hi list, Is there a way to get Clojure warnings to act as errors and abort the attempted operation? For now, I'm mainly interested in doing this in the repl, because I will often do something like this: (defn fn [x] (+ 1 x)) ; WARNING: fn already refers to: #'clojure.core/fn ... Oops! Did not really want to do that! In some cases it's possible to unbind accidental bindings but in other cases it's either not possible or just doesn't seem to work for me and I end up having to restart the repl, which is annoying. I'd rather just prevent it happening at all. In production code I'm not a big fan of warnings either, as with a few rare exceptions they correctly indicate that something is wrong, but can lead to silent errors instead of fast, noisy failure. That leads to things like subtle errors in your persistent data that comes back to bite you several months later, far removed from the original error, making it very hard to diagnose the root cause of the problem. So again, a hard failure mode would be welcome. - Robert -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [ANN] Clojure 1.7.0-alpha2
If anything let's add more bangs to the name. Unlike any of atom/ref/agent, volatile! is not really part of the familiar state model. Yes it applies a function to a thing, changing the thing. Like Luc says, not atomically. The linux hdparm tool has the –yes-i-know-what-i-am-doing and --please-destroy-my-drive flags. Those could be useful. Maybe (binding [*please-randomly-break-my-application* true] ...) On Monday, September 8, 2014 3:22:48 PM UTC-4, Luc wrote: +1 for the ! No atomic changes here, no coordination whatsoever. At the mercy of the caller... I asked Rich and he said making a volatile is as dangerous as any ! op. Some people have also asked about vswap! being a macro instead of a method on Volatile. The issue there is that vswap! takes a variadic number of update function args. If implemented as a method, you'd need to provide multiple arities or eventually use apply (like in Atom's swap! https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/Atom.java#L79) - doing it in a macro lets that expansion take place at compile time to provide better performance without the apply. On Mon, Sep 8, 2014 at 1:36 PM, Jozef Wagner jozef@gmail.com javascript: wrote: FYI the ticket about volatile is at http://dev.clojure.org/jira/browse/CLJ-1512 and the same question was raised there. On Mon, Sep 8, 2014 at 4:25 PM, Frantisek Sodomka fsod...@gmail.com javascript: wrote: Hello, I posted a question about volatiles on the github commit: https://github.com/clojure/clojure/commit/60440977823752f13a3fec3637538e9a1d68c5d4 I don't know if anybody noticed, so... why is volatile created with function volatile! and not volatile ? Atoms, refs and agents don't have exclamation mark in their constructor functions. Should I think about volatiles as mutable locals? :-) František On Friday, September 5, 2014 4:26:53 PM UTC+2, Alex Miller wrote: Clojure 1.7.0-alpha1 is now available. Try it via - Download: http://central.maven.org/maven2/org/clojure/clojure/1.7.0-alpha2/ - Download securely: https://repo1.maven.org/maven2/org/clojure/clojure/1.7.0-alpha2/ - Leiningen: [org.clojure/clojure 1.7.0-alpha2] Highlights below, full change log here: https://github.com/clojure/clojure/blob/master/changes.md For users of Clojure 1.7.0-alpha1, there have been a few important changes in transducers since alpha1: - Removed flatmap transducer - Added cat transducer - mapcat 1-arity is now a transducer, specifically: (comp (map f) cat) - The completing function has been lifted to be public Clojure 1.7.0-alpha2 has the changes below from 1.6.0: ## 1 New and Improved Features ### 1.1 Transducers Transducers is a new way to decouple algorithmic transformations from their application in different contexts. Transducers are functions that transform reducing functions to build up a recipe for transformation. Also see: http://blog.cognitect.com/blog/2014/8/6/transducers-are-coming Many existing sequence functions now have a new arity (one fewer argument than before). This arity will return a transducer that represents the same logic but is independent of lazy sequence processing. Functions included are: * conj (conjs to []) * map * mapcat * filter * remove * take * take-while * drop * drop-while * cycle * take-nth * replace * partition-by * partition-all * keep * keep-indexed Additionally some new transducer functions have been added: * cat - concatenates the contents of each input * de-dupe - removes consecutive duplicated values * random-sample - returns items from coll with random probability And this function can be used to make completing transforms: * completing There are also several new or modified functions that can be used to apply transducers in different ways: * sequence - takes a transformation and a coll and produces a lazy seq * transduce - reduce with a transformation (eager) * iteration - returns an iterable/seqable/reducible seq of applications of the transducer to items in coll. Applications are re-performed with every iterator/seq/reduce. * run! - run the transformation for side effects on the collection There have been a number of internal changes to support transducers: * volatiles - there are a new set of functions (volatile!, vswap!, vreset!, volatile?) to create and use volatile boxes to hold state in stateful transducers. Volatiles are faster than atoms but give up atomicity
Re: Interop nightmare
On Sep 8, 2014, at 4:48 PM, Michael Klishin michael.s.klis...@gmail.com wrote: Sounds more like Just enough Java for Clojure. Which I think would have too small an audience to be worth the effort. I'd buy it for sure. I bet that some of my students would too. -Lee -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Interop nightmare
On Tue, Sep 9, 2014 at 3:09 AM, Sean Corfield s...@corfield.org wrote: I find that it is quite difficult to use clojure unless one knows Java, which I believe to be a barrier to new comers. I'm surprised every time I hear this. You can write a lot of Clojure without having to do any interop so you can mostly ignore Java altogether unless you specifically want to work with a Java library. I don't think any of my Clojure books mention how to convert a string to a numeric, which is missing in Clojure and hence requires Java interop. That's just one example of a fairly basic thing that would be a barrier to new comers. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Interop nightmare
On Sep 8, 2014, at 9:09 PM, Alan Busby thebu...@gmail.com wrote: On Tue, Sep 9, 2014 at 3:09 AM, Sean Corfield s...@corfield.org wrote: I find that it is quite difficult to use clojure unless one knows Java, which I believe to be a barrier to new comers. I'm surprised every time I hear this. You can write a lot of Clojure without having to do any interop so you can mostly ignore Java altogether unless you specifically want to work with a Java library. I don't think any of my Clojure books mention how to convert a string to a numeric, which is missing in Clojure and hence requires Java interop. That's just one example of a fairly basic thing that would be a barrier to new comers. Do you mean this?: = (read-string 1.23) 1.23 I manage to get by with very little Java interop, but I'd love to have more guidance for doing it when I need it. -Lee -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [ANN] aprint (awesome print) released
Cool On Friday, September 5, 2014 5:50:10 AM UTC+8, Vladimir Bokov wrote: Hi folks, I got just tired to gazing into big amount of data and scroll 3-4 screens of my 13' laptop to grasp the structure, so I used pprint's pretty printer, but add colors and changed indentation *by default* (actually pprint has tuning parameters, too, but anyway it's breaking maps by single entry by line...) Now the screen area gets used more effectively and looks more friendly imo :) See it: https://github.com/razum2um/aprint Looking forward yours opinion if I should make a nrepl middleware to use it *right away*, without doing (ap) every time ;) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: can't connect with Datomic transactor
Hi Josh,
I know that I have the transactor running, creating databases works, just
connecting that doesn't...
I tried your solution, but I'm still getting the same error, I would like
to know at least maybe a better way to debug it, the major issue is that
the error messages doesn't give any clue about what's wrong... I really
believe that's something with my env, but it's being really hard to track
down what it is.
---
Wilker Lúcio
http://about.me/wilkerlucio/bio
Woboinc Consultant
+55 81 82556600
On Mon, Sep 8, 2014 at 6:13 PM, Josh Lehman jalehma...@gmail.com wrote:
Wilker,
It seems that you haven't actually started the transactor. For developing,
I'd recommend using lein-datomic
https://github.com/johnwayner/lein-datomic.
Hope that helps,
-Josh
On Sunday, September 7, 2014 8:06:55 PM UTC-7, Wilker wrote:
Hi,
I was using Datomic in memory for a few days, and now I tried to switch
for a more persistent storage. First I tried just using the free, but I was
getting this error:
CompilerException java.lang.NoSuchMethodError:
clojure.lang.SeqIterator.init(Lclojure/lang/ISeq;)V,
compiling:(form-init5913779045640355531.clj:1:11)
Then I tried to use pro to see if that works, but end up with same
results.
The funny part is, if I try to connect just after launching the
transactor I get this:
(def conn (d/connect uri))
CompilerException clojure.lang.ExceptionInfo: Error communicating with
HOST localhost on PORT 4334 {:alt-host nil, :peer-version 2, :password
..., :username ..., :port 4334, :host localhost, :version 0.9.4894,
:timestamp 1410145249419, :encrypt-channel true}, compiling:(form-
init5913779045640355531.clj:1:11)
Then if I run same thing again:
(def conn (d/connect uri))
CompilerException java.lang.NoSuchMethodError:
clojure.lang.SeqIterator.init(Lclojure/lang/ISeq;)V,
compiling:(form-init5913779045640355531.clj:1:11)
Running (d/create-database) works just fine (I can confirm by checking on
the console).
All that I get from datomic transactor log is this:
2014-09-08 00:05:24.455 INFO defaultdatomic.lifecycle - {:tid 26,
:pid 58071, :host localhost, :port 4334, :encrypt-channel true, :version
0.9.4894, :timestamp 1410145524454, :event :transactor/heartbeat, :rev
198}
I have no more idea about what to do to fix it... You guys know what this
issue is about?
Thanks.
---
Wilker Lúcio
http://about.me/wilkerlucio/bio
Woboinc Consultant
+55 81 82556600
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Re: can't connect with Datomic transactor
Actually, I just got an answer on the Datomic list, the problem is that I'm
using Clojure 1.7.0-alpha2.
So, just have to wait for a new version now.
---
Wilker Lúcio
http://about.me/wilkerlucio/bio
Woboinc Consultant
+55 81 82556600
On Tue, Sep 9, 2014 at 1:12 AM, Wilker wilkerlu...@gmail.com wrote:
Hi Josh,
I know that I have the transactor running, creating databases works, just
connecting that doesn't...
I tried your solution, but I'm still getting the same error, I would like
to know at least maybe a better way to debug it, the major issue is that
the error messages doesn't give any clue about what's wrong... I really
believe that's something with my env, but it's being really hard to track
down what it is.
---
Wilker Lúcio
http://about.me/wilkerlucio/bio
Woboinc Consultant
+55 81 82556600
On Mon, Sep 8, 2014 at 6:13 PM, Josh Lehman jalehma...@gmail.com wrote:
Wilker,
It seems that you haven't actually started the transactor. For
developing, I'd recommend using lein-datomic
https://github.com/johnwayner/lein-datomic.
Hope that helps,
-Josh
On Sunday, September 7, 2014 8:06:55 PM UTC-7, Wilker wrote:
Hi,
I was using Datomic in memory for a few days, and now I tried to switch
for a more persistent storage. First I tried just using the free, but I was
getting this error:
CompilerException java.lang.NoSuchMethodError:
clojure.lang.SeqIterator.init(Lclojure/lang/ISeq;)V,
compiling:(form-init5913779045640355531.clj:1:11)
Then I tried to use pro to see if that works, but end up with same
results.
The funny part is, if I try to connect just after launching the
transactor I get this:
(def conn (d/connect uri))
CompilerException clojure.lang.ExceptionInfo: Error communicating with
HOST localhost on PORT 4334 {:alt-host nil, :peer-version 2, :password
..., :username ..., :port 4334, :host localhost, :version 0.9.4894,
:timestamp 1410145249419, :encrypt-channel true}, compiling:(form-
init5913779045640355531.clj:1:11)
Then if I run same thing again:
(def conn (d/connect uri))
CompilerException java.lang.NoSuchMethodError:
clojure.lang.SeqIterator.init(Lclojure/lang/ISeq;)V,
compiling:(form-init5913779045640355531.clj:1:11)
Running (d/create-database) works just fine (I can confirm by checking
on the console).
All that I get from datomic transactor log is this:
2014-09-08 00:05:24.455 INFO defaultdatomic.lifecycle - {:tid 26,
:pid 58071, :host localhost, :port 4334, :encrypt-channel true, :version
0.9.4894, :timestamp 1410145524454, :event :transactor/heartbeat, :rev
198}
I have no more idea about what to do to fix it... You guys know what
this issue is about?
Thanks.
---
Wilker Lúcio
http://about.me/wilkerlucio/bio
Woboinc Consultant
+55 81 82556600
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