Re: beginner questions
Sean, 2012/8/5 Sean Corfield seancorfi...@gmail.com On Sun, Aug 5, 2012 at 12:53 AM, Catonano caton...@gmail.com wrote: (clojure.contrib.str-utils2/grep #myPattern one row \n another row) Just as a side note, the old monolithic contrib library has been deprecated and many parts are no longer maintained (and you may have problems trying to use it with Clojure 1.3 onward). The parts of old contrib that active maintainers have been moved to new modular libraries: http://dev.clojure.org/display/design/Where+Did+Clojure.Contrib+Go thank you for this information. I tried to move to Coljure 1.4 (as it's the current version) I could move from clojure.contrib.str-utils2/split to clojure.string/split but I couldn't move from clojure.contrib.str-utils2/grep to clojure.string/grep because it seems that in clojure.string there's no grep function Is grep gone ? I was using it to isolate a couple of lines in a javascript source code Thanks again -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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 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
Re: beginner questions
On Wed, Aug 8, 2012 at 12:06 AM, Catonano caton...@gmail.com wrote: because it seems that in clojure.string there's no grep function Is grep gone ? Look into re-find etc. There's pretty good regex support in core Clojure. -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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
Re: ClojureScript protocols
On Wed, Aug 8, 2012 at 4:47 AM, David Nolen dnolen.li...@gmail.com wrote: Ok, I figured out (well, not I, but m0smith from #clojure): protocols should be imported using :require :as, rather than :use :only. This seems like a bug to me. Sure, it does look as one to me as well. Should I do something about it? Create an issue somewhere? I don't know what to do about bugs in Clojure yet. -- Alexander -- 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
Re: ANN lein-expectations 0.0.7
On Aug 8, 2012, at 1:09 AM, Sean Corfield wrote: expecting not to throw a specific exception is a bit trickier... You can expect a specific exception easily, but not an exception message easily... -- 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
Re: core.cache 0.6.2 is not available from Central
Fogus: core.cache README currently recommends installing 0.6.2: The README predates the push to Maven Central and it looks like the release failed. I will try again, but it'll be a bit before it makes it to Central. Would it be possible to at least make README recommend installing 0.6.1? Given that regular Clojure users cannot submit a pull request. MK -- 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
Re: core.cache 0.6.2 is not available from Central
Hi, why recommending a specific version at all? Just point to search.maven.org or mvnrepository.com and let the user choose one? Kind regards Meikel -- 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
Re: core.cache 0.6.2 is not available from Central
Meikel Brandmeyer (kotarak): why recommending a specific version at all? Just point to search.maven.org or mvnrepository.com and let the user choose one? Because users do not want to choose? Just give her a version to install, asking people to go through maven search results figuring out how to determine what's the most recent version is at least not very friendly. MK mich...@defprotocol.org -- 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
Re: core.cache 0.6.2 is not available from Central
Hi, Am Mittwoch, 8. August 2012 12:06:36 UTC+2 schrieb Michael Klishin: Because users do not want to choose? Just give her a version to install, asking people to go through maven search results figuring out how to determine what's the most recent version is at least not very friendly. I'm not sure what the problem with this result page is: http://mvnrepository.com/artifact/org.clojure/core.cache. If you don't find the most recent version at a glance, you probably don't read the README anyway. Kind regards Meikel -- 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
Re: ClojureScript protocols
On Wed, Aug 8, 2012 at 3:52 AM, Alexander Solovyov alexan...@solovyov.net wrote: On Wed, Aug 8, 2012 at 4:47 AM, David Nolen dnolen.li...@gmail.com wrote: Ok, I figured out (well, not I, but m0smith from #clojure): protocols should be imported using :require :as, rather than :use :only. This seems like a bug to me. Sure, it does look as one to me as well. Should I do something about it? Create an issue somewhere? I don't know what to do about bugs in Clojure yet. -- Alexander Yes please file a ticket: http://dev.clojure.org/jira/browse/CLJS David -- 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
Re: core.cache 0.6.2 is not available from Central
Meikel, For you (and me) it's not a problem; I have even looked at pom.xml files in certain cases to figure out the latest version, etc. but normal people don't care, they wish to get started as soon as possible. People don't read README files as well, but on Github README files are rendered as the home-page for a repository by default so we should try to put in as much useful information right there as possible. At the very least, you'd want to mention the latest stable release (a SNAPSHOT as well if feasible) and the repository (in case it's not on either central or clojars). Regards, BG On Wed, Aug 8, 2012 at 3:36 PM, Michael Klishin michael.s.klis...@gmail.com wrote: Meikel Brandmeyer (kotarak): why recommending a specific version at all? Just point to search.maven.org or mvnrepository.com and let the user choose one? Because users do not want to choose? Just give her a version to install, asking people to go through maven search results figuring out how to determine what's the most recent version is at least not very friendly. MK mich...@defprotocol.org -- 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 -- Baishampayan Ghose b.ghose at gmail.com -- 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
Re: core.cache 0.6.2 is not available from Central
For the record I do not mind (and much prefer) to list the latest stable release in the README. No problem. In this case I made the change, scheduled the release, and went somewhere else. As it turns out the release process is wonky so 0.6.2 has not yet made it out. The previous version is now listed until the latest version makes it out. -- 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
basic question , clojure io
does clojure have a strict split between side-effects and pure functions like haskell; I guess what i have in my head is a rigorous split between effectfull 'procedures' and pure 'functions',the latter cannot call the former; although i know thats' implemented through the more general mechanism of monads in haskell. -- 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
Re: Overtone - Live @ Arnolfini
On 7 Aug 2012, at 15:16, Roberto Mannai roberm...@gmail.com wrote: Interesting, I guess the monome is hooked by: (def m (poly/init /dev/tty.usbserial-m64-0790)) And the incoming events by (poly/on-press... Etc Yes, although in the future all the monome events will be sent directly to Overtone's event system. This is currently how MIDI devices are now handled and is the recommended approach to connecting external controls with Overtone. Using the event system allows you (and other band hackers connected to the JVM process) to bind handlers from arbitrary namespaces rather than having to have direct access to the `m` var in the ns you do poly/init. I even didn't suspect that Emacs would allow such graphical overlays, have any link to doc? It's not actually graphical - I run Emacs in a terminal emulator ;-) Docs for overlays can be found here: http://www.gnu.org/software/emacs/manual/html_node/elisp/Overlays.html#Overlays Coming to the very exciting topic about interprocess comunication between Emacs and a Midi controller I'll look forward to your code - I hope you'd like give us at least a general overview of the architecture :) Keep pestering me and I'll get round to it. I've only just started to explore the possibilities of having such a close relationship between Emacs and Clojure - but what I've seen so far is really promising. There will most certainly be more to come... Sam --- http://sam.aaron.name -- 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
Re: Clojure group in DFW area
Hello, Is this group still meeting? (When?) Would be interested in attending the next one if possible to meet like-minded folks. Regards Vish (https://github.com/vishk) On Wednesday, June 15, 2011 11:02:10 AM UTC-5, ch...@rubedoinc.com wrote: Everyone, sorry for late notice but are meeting tonight is cancelled due to some scheduling conflicts. We have another meeting set for Tuesday June 28th 630PM - 900PM @ Rubedo, inc. 14580 Beltwood Pkwy E Suite 103 Farmers Branch, TX 75244 See you then ! On Jun 3, 9:46 am, ch...@rubedoinc.com ch...@rubedoinc.com wrote: Meeting is growing strong! We will be looking at some group projects to take on that we can use to stretch our clojure skills. Make the next meeting to be a part of it! Wednesday June 15th 630PM - 900PM @ Rubedo, inc. 14580 Beltwood Pkwy E Suite 103 Farmers Branch, TX 75244 (wifi available) On May 20, 11:08 am, ch...@rubedoinc.com ch...@rubedoinc.com wrote: Thanks everyone for attending. Our next meeting is scheduled for Our next meeting is scheduled for May 31th 630PM - 900PM @ Rubedo, inc. 14580 Beltwood Pkwy E Suite 103 Farmers Branch, TX 75244 (wifi available) there will be pizza and sodas, so bring yourclojurequestions and your appetite. Reply in this thread if you will be attending so that I can get a head count for pizza. On May 16, 12:41 pm, ch...@rubedoinc.com ch...@rubedoinc.com wrote: Meeting tonight, see you there ! Our next meeting is scheduled for May 16th 630PM - 900PM @ Rubedo, inc. 14580 Beltwood Pkwy E Suite 103 Farmers Branch, TX 75244 (wifi available) On May 4, 11:20 am, ch...@rubedoinc.com ch...@rubedoinc.com wrote: Thanks everyone for attending the first meeting. It was great to talk clojurewith some like minded people who are excited by the possibilities ! Our next meeting is scheduled for May 16th 630PM - 900PM @ Rubedo, inc. 14580 Beltwood Pkwy E Suite 103 Farmers Branch, TX 75244 (wifi available) Right now, we will try for two meetings each month. In the beginning, these will be mostly hack nights. As the group matures, we will look at doing presentations / talks onClojure. As most of the group is relatively new toClojure, we decided to start with thehttp://projecteuler.net/problemsasaway to get familiar with the language and have some common solutions to discuss. At our next meeting, we will bring our solutions for problems 1-10 and discuss how we went about solving them. All are welcome ! On Apr 25, 9:08 pm, Christopher Redinger ch...@clojure.com wrote: ch...@rubedoinc.com wrote: Rubedo, inc. 14580 Beltwood Pkwy E Suite 103 Farmers Branch, TX 75244 When: 630PM Monday May 2nd What:ClojureInterest Group Topic: 1st meeting, what our goals are, and how to take over the world withClojure Hi Chris! Thanks for offering to host the group. I've added a link to this thread on theClojureUser Groups page: http://dev.clojure.org/display/community/Clojure+User+Groups. Hopefully to help people who might be looking. We can update the link to something with a little more information if you get a page set up somewhere. Also, if you choose to go through Meetup, they have provided us with a code that gives a discount toClojuregroups. See the above page for more information. Thanks again, and let me know if there's anythingClojure/core can help you out with! Thanks, 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
Writing code to get the source of a function
Dear all, I am trying to write some code that would take a function name, get its source code, and create a new function based on the source code. Unfortunately, the function 'source' from clojure.repl doesn't seem to be working for the functions I define. Here is my code: (ns test-src.core (:require [clojure.repl])) (defn my-function [x] (+ x 1)) (defn print-src [] (println (clojure.repl/source my-function))) When I try print-src on the repl, I get: test-src.core (print-src) Source not found nil nil So my question is: how can I access to the source code of the functions I write? Many 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
Re: Overtone - Live @ Arnolfini
On 7 Aug 2012, at 15:16, Roberto Mannai roberm...@gmail.com wrote: Interesting, I guess the monome is hooked by: (def m (poly/init /dev/tty.usbserial-m64-0790)) And the incoming events by (poly/on-press... Etc Yes, although in the future all the monome events will be sent directly to Overtone's event system. This is currently how MIDI devices are now handled and is the recommended approach to connecting external controls with Overtone. Using the event system allows you (and other band hackers connected to the JVM process) to bind handlers from arbitrary namespaces rather than having to have direct access to the `m` var in the ns you do poly/init. I even didn't suspect that Emacs would allow such graphical overlays, have any link to doc? It's not actually graphical - I run Emacs in a terminal emulator ;-) Docs for overlays can be found here: http://www.gnu.org/software/emacs/manual/html_node/elisp/Overlays.html#Overlays Coming to the very exciting topic about interprocess comunication between Emacs and a Midi controller I'll look forward to your code - I hope you'd like give us at least a general overview of the architecture :) Keep pestering me and I'll get round to it. I've only just started to explore the possibilities of having such a close relationship between Emacs and Clojure - but what I've seen so far is really promising. There will most certainly be more to come... Sam --- http://sam.aaron.name -- 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
Re: basic question , clojure io
There is no such thing in Clojure. Separation of IO and non IO is done by: - encouraging pure functions - providing very good pure data structures, and libraries -- 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
Re: What concurrency models to document?
Hey, A bit late to the party but something I'd love to see in the book is an approachable summary/description/use cases of the main concurrency models at play today: event-based and thread-based concurrency. I see this section helping people compare Clojure with something like Node.js or Ruby with EventMachine (Clojure has aleph[1] for that purpose). There is a lot of controversy around the topic and I believe even a brief discussion on the subject will be beneficial. This paper has a lot a good info: http://static.usenix.org/events/hotos03/tech/full_papers/vonbehren/vonbehren_html/ (it is biased towards a threaded model though). Would this be way out of scope for your book? - Even not exactly what you were after when you asked about concurrency models? [1] https://github.com/ztellman/aleph/ Cheers, Leonardo Borges www.leonardoborges.com On Fri, Aug 3, 2012 at 1:11 PM, cej38 junkerme...@gmail.com wrote: I think that you have to talk about concurrency! It is on everyone's mind. I would like to see the discussion go further than what I have seen in most other Clojure books. If you are REALLY interested in concurrency, you are probably interested in looking at using more than one node in a cluster. Two areas that are always interested in concurrency are big data and high performance computing. I come from a background where the only idea of how to do concurrency is through the use of MPI. I would like to learn how to get nodes on a cluster to talk to each other within a Clojure enviroment. Further, a paragraph or two about what use cases each of the node interconnect models would work best for would be absolutely awesome. As an example, I know that all of the following exist but I don't know when to use what (I know clojure-hadoop is NOT what I want for my use cases). clojure-hadoop swamiji cacalog zookeeper-clj storm Avout lein-condor -- 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 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
Re: Writing code to get the source of a function
The source function only works for function where the .clj where the function is defined is in the classpath. If you have control over all functions, I'd suggest using https://github.com/technomancy/serializable-fn when defining them. On Wed, Aug 8, 2012 at 11:19 AM, Samuel Lê samuel...@gmail.com wrote: Dear all, I am trying to write some code that would take a function name, get its source code, and create a new function based on the source code. Unfortunately, the function 'source' from clojure.repl doesn't seem to be working for the functions I define. Here is my code: (ns test-src.core (:require [clojure.repl])) (defn my-function [x] (+ x 1)) (defn print-src [] (println (clojure.repl/source my-function))) When I try print-src on the repl, I get: test-src.core (print-src) Source not found nil nil So my question is: how can I access to the source code of the functions I write? Many 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 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
Re: Writing code to get the source of a function
On Wed, Aug 08, 2012 at 09:19:15AM +, Samuel Lê wrote: Dear all, I am trying to write some code that would take a function name, get its source code, and create a new function based on the source code. Unfortunately, the function 'source' from clojure.repl doesn't seem to be working for the functions I define. Here is my code: (ns test-src.core (:require [clojure.repl])) (defn my-function [x] (+ x 1)) (defn print-src [] (println (clojure.repl/source my-function))) Try: (defn print-src [] (println (with-out-str (clojure.repl/source my-function The source method is designed for the REPL, and so dumps to *out* by default (you can confirm this yourself, appropriately enough, by doing (source source)) Cheers, Josh -- Joshua Ballanco ELC Technologies™ 1771 NW Pettygrove Street, Suite 140 Portland, OR, 97209 jballa...@elctech.com P +1 866.863.7365 F +1 877.658.6313 M +1 646.463.2673 T +90 533.085.5773 http://www.elctech.com -- 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
Re: Overtone - Live @ Arnolfini
Eppccc!! On Friday, August 3, 2012 6:47:50 AM UTC-4, Sam Aaron wrote: Hi everyone, for those interested, I just put up a screencast of a performance I did with Overtone on Friday the 27th of July at the Arnolfini art gallery in Bristol, UK: https://vimeo.com/46867490 The screen resolution is a little odd as I mirrored my display to that of the projector. Also, the sound starts cutting out for about 20s in the middle due to some SuperCollider memory issues I managed to run into - it was a hairy moment, but I managed to recover. It was a lot of fun projecting Clojure code on a massive screen to an audience of interesting art enthusiasts :-) Also, the code I used to do the performance is here: http://github.com/samaaron/arnold Enjoy! Sam --- http://sam.aaron.name -- 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
Functional Composition (with Overtone)
Hey everyone, Chris Ford gave a talk on functional composition with Overtone in London recently and it's now online: http://skillsmatter.com/podcast/home/functional-composition Chris really delivers a beautifully paced introduction to a huge range of fundamental musical concepts through the transmission vector of Clojure. It's truly fantastic to watch how seemingly magic and untouchable concepts such as classical music can be destructured piece by piece into understandable Clojure code. Sam --- http://sam.aaron.name -- 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
Re: DAG (Direct Acyclic Graph) and Bayesian Network help
I just published an announcement regarding Raposo: https://github.com/cemerick/raposo/blob/master/README.md My apologies, - Chas -- http://cemerick.com [Clojure Programming from O'Reilly](http://www.clojurebook.com) On Jul 14, 2012, at 1:24 PM, Walter van der Laan wrote: Chas Emerick did a presentation on this: http://blip.tv/clojure/chas-emerick-modeling-the-world-probabilistically-using-bayesian-networks-in-clojure-5961126 But AFAIK the raposo library has not been published yet. On Saturday, July 14, 2012 4:20:17 PM UTC+2, Simone Mosciatti wrote: Hi guys, I'm trying to develop a Bayesian Network just for fun XD My first problem is to understand how represent the graph necessary a DAG. I come out with something : https://gist.github.com/3111539 (Very very first stage I just finish to write this code) But I have some question to how represent properly the DAG. I need to map every child of every node, or I just need to know the (non-)descendants of every node ? Why ? Do you have any useful link that I can use ? Thank you guys anyway. PS: This is still me http://stackoverflow.com/questions/11482474/clojure-dag-bayesian-network#comment15165499_11482474 -- 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 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
Attractive examples of function-generating functions
I'm looking for medium-scale examples of using function-generating functions. I'm doing it because examples like this: (def make-incrementer (fn [increment] (fn [x] (+ increment x ... or this: (def incish (partial map + [100 200 300])) ... show the mechanics, but I'm looking for examples that would resonate more with an object-oriented programmer. Such examples might be ones that close over a number of values (which looks more like an object), or generate multiple functions that all close over a shared value (which looks more like an object), or use closures to avoid the need to have some particular argument passed from function to function (which looks like the `this` in an instance method). Note: please put the flamethrower down. I'm not saying that looking like objects is the point of higher-order functions. I'll give full credit. - Brian Marick, Artisanal Labrador Contract programming in Ruby and Clojure Occasional consulting on Agile -- 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
Re: core.cache 0.6.2 is not available from Central
On Wed, Aug 8, 2012 at 2:52 AM, Meikel Brandmeyer (kotarak) m...@kotka.de wrote: why recommending a specific version at all? Just point to search.maven.org or mvnrepository.com and let the user choose one? Because Clojure/core have decided - after quite a bit of discussion - that providing specific version details is better for users. I certainly agree with them. One of the most common questions I hear about libraries in general is How do I add this to my project? - users want a specific string they can just copy'n'paste into project.clj without needing to click through to Maven and figure out group / artifact / version stuff! -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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
Re: core.cache 0.6.2 is not available from Central
On Wed, Aug 8, 2012 at 11:46 AM, Sean Corfield seancorfi...@gmail.com wrote: On Wed, Aug 8, 2012 at 2:52 AM, Meikel Brandmeyer (kotarak) m...@kotka.de wrote: why recommending a specific version at all? Just point to search.maven.org or mvnrepository.com and let the user choose one? Because Clojure/core have decided - after quite a bit of discussion - that providing specific version details is better for users. Specifically: http://dev.clojure.org/display/design/Contrib+Library+READMEs -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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
Re: ANN lein-expectations 0.0.7
On Wed, Aug 8, 2012 at 1:02 AM, Jay Fields j...@jayfields.com wrote: On Aug 8, 2012, at 1:09 AM, Sean Corfield wrote: expecting not to throw a specific exception is a bit trickier... You can expect a specific exception easily, but not an exception message easily... Yeah, I haven't thought up ways to make exception handling cleaner with Expectations yet. If I do, I'll open some tickets. Overall tho', I love working with it and, in addition to unit tests, we're also using it with clj-webdriver to run Selenium-based tests: it makes for extremely readable tests! -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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
Re: Writing code to get the source of a function
(println (with-out-str (foo))) is silly - it's the same as (do (foo) nil), which in many cases (eg, in this one) is the same as just (foo). On Wednesday, August 8, 2012 6:25:35 AM UTC-7, Joshua Ballanco wrote: On Wed, Aug 08, 2012 at 09:19:15AM +, Samuel Lê wrote: Dear all, I am trying to write some code that would take a function name, get its source code, and create a new function based on the source code. Unfortunately, the function 'source' from clojure.repl doesn't seem to be working for the functions I define. Here is my code: (ns test-src.core (:require [clojure.repl])) (defn my-function [x] (+ x 1)) (defn print-src [] (println (clojure.repl/source my-function))) Try: (defn print-src [] (println (with-out-str (clojure.repl/source my-function The source method is designed for the REPL, and so dumps to *out* by default (you can confirm this yourself, appropriately enough, by doing (source source)) Cheers, Josh -- Joshua Ballanco ELC Technologies™ 1771 NW Pettygrove Street, Suite 140 Portland, OR, 97209 jbal...@elctech.com javascript: P +1 866.863.7365 F +1 877.658.6313 M +1 646.463.2673 T +90 533.085.5773 http://www.elctech.com -- 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
Re: ANN lein-expectations 0.0.7
Silly question but how is Expectations better or different from Midje? I'm just starting out with Midje and was just wondering? Thanks, Andrew On Monday, 6 August 2012 19:43:18 UTC+1, Sean Corfield wrote: lein-expectations - the plugin for running Jay Fields' awesome Expectations testing library - has been updated for Leiningen 2.0. If you are using Leiningen 1.x, continue to use lein-expectations 0.0.5. If you are on Leiningen 2.x, you should use lein-expectations 0.0.7 so that exit on test failure is handled correctly. 0.0.6 added a partial fix for exit codes in Leiningen 2.0 but it didn't work properly with with-profile. After discussions with Phil H about exit status codes, the logic was changed / simplified for the 0.0.7 release. -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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
Re: core.cache 0.6.2 is not available from Central
Hi, Am 08.08.2012 um 20:48 schrieb Sean Corfield: On Wed, Aug 8, 2012 at 11:46 AM, Sean Corfield seancorfi...@gmail.com wrote: On Wed, Aug 8, 2012 at 2:52 AM, Meikel Brandmeyer (kotarak) m...@kotka.de wrote: why recommending a specific version at all? Just point to search.maven.org or mvnrepository.com and let the user choose one? Because Clojure/core have decided - after quite a bit of discussion - that providing specific version details is better for users. Specifically: http://dev.clojure.org/display/design/Contrib+Library+READMEs None of the points mentioned there requires explicit specification of the last available version. This does not necessarily include a specific version. “Instructions for including the library as a dependency in Maven / Leiningen” A link to eg. mvnrepository.com satisfies this for Maven Central. “Links to the available releases on Maven Central and oss.sonatype.org” Actually not providing a specific version in the dependency explanation would force people to understand what they are doing. I would prefer library authors spending time on writing good documentation for their libraries instead of serving trivial information on a silver platter. Anyway, this is bike shedding. Kind regards Meikel signature.asc Description: Message signed with OpenPGP using GPGMail
Re: core.cache 0.6.2 is not available from Central
On Wed, Aug 8, 2012 at 12:28 PM, Meikel Brandmeyer m...@kotka.de wrote: http://dev.clojure.org/display/design/Contrib+Library+READMEs None of the points mentioned there requires explicit specification of the last available version. See data.json which is the reference model. Most of the contrib READMEs have been updated in the last 48 hours to use this new format (so this discussion is moot - as well as being bike-shedding :) -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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
Re: Attractive examples of function-generating functions
I'm looking for medium-scale examples of using function-generating functions. I'm not sure if this is exactly what you're looking for, but this sort of thing is pretty cool: (defn make-point [x y] (fn [member] (cond (= member :x) x (= member :y) y))) We're basically creating an immutable object without using a single data structure: (def pnt (make-point 1 2)) = (pnt :x) 1 = (pnt :y) 2 You can even get a bit more fancy: (defn make-point [x y] (fn [member] (cond (= member :x) x (= member :y) y (= member :with-x) (fn [newx] (make-point newx y) Timothy -- 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
Question on Clojure/Heroku deployment
Hi, When I try to run `git push heroku master` I am getting this: - Heroku receiving push ! Heroku push rejected, no Cedar-supported app detected Can anybody help me with how to diagnose the problem? Is there a checklist I can try to verify from? I have a project.clj (works with Lein 1.7.1) in the toplevel directory of a git project. I also have a Procfile that works OK with foreman. Shantanu -- 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
Re: Attractive examples of function-generating functions
trampolines is a slightly different example. -- 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
Re: core.cache 0.6.2 is not available from Central
Meikel Brandmeyer: This does not necessarily include a specific version. “Instructions for including the library as a dependency in Maven / Leiningen” Arguing just for the sake of it? Clojure learning curve is already steep enough. Lets make it even steeper by asking people to figure out UIs of all those Maven search resources and which version is the last and whether using -SNAPSHOT versions is safe. Don't make me think is a good rule to live by for library maintainers. MK mich...@defprotocol.org -- 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
Re: Question on Clojure/Heroku deployment
On Wed, Aug 8, 2012 at 1:58 PM, Shantanu Kumar kumar.shant...@gmail.com wrote: When I try to run `git push heroku master` I am getting this: - Heroku receiving push ! Heroku push rejected, no Cedar-supported app detected Can anybody help me with how to diagnose the problem? Is there a checklist I can try to verify from? I have a project.clj (works with Lein 1.7.1) in the toplevel directory of a git project. I also have a Procfile that works OK with foreman. I don't think it's possible to get that error if you have a top-level project.clj file, but if you send a tarball of the project to phil.hagelb...@heroku.com I can take a look. -Phil -- 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
Re: Attractive examples of function-generating functions
On Wed, Aug 8, 2012 at 11:48 AM, Brian Marick mar...@exampler.com wrote: I'm looking for medium-scale examples of using function-generating functions. Such examples might be ones that ... use closures to avoid the need to have some particular argument passed from function to function (which looks like the `this` in an instance method). I try and use a greedy parser combinator as the next jump, and as example of hiding arguments. String parsing is a small, yet non-trivial example, that doesn't require domain knowledge. Something like: (defn result [value] (fn [string] [value string])) (defn pred [predicate] (fn [string] (if (predicate (first string)) [(first string) (rest string)]))) (defn orp [f g] (fn [string] (or (f string) (g string (defn bind [parser f] (fn [string] (if-let [[result s2] (parser string)] ((f result) s2 (defn many [parser] (let [f (bind parser (fn [h] (bind (many parser) (fn [rst] (result (cons h rst))] (orp f (result [] (def letter (pred #(if % (Character/isLetter % (def word (bind (many letter) (fn [w] (result (apply str w) (word foo) ;= [foo ()] The closest I see to an implicit this is: ((bind word (fn [w1] (bind (pred #(= % \space)) (fn [_] (bind word (fn [w2] (result [w1 w2]))) foo bar baz) ;= [[foo bar] (\space \b \a \z)] Here word and the space predicate are called on the string, but its only ever mentioned as the argument. However, it is kinda ugly without a macro to hide all the bind/fn pairs. -- 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
Re: Writing code to get the source of a function
Using serializable works fine for me. I find its code very instructive as well. Thanks! On Wed, Aug 8, 2012 at 7:18 PM, Alan Malloy a...@malloys.org wrote: (println (with-out-str (foo))) is silly - it's the same as (do (foo) nil), which in many cases (eg, in this one) is the same as just (foo). On Wednesday, August 8, 2012 6:25:35 AM UTC-7, Joshua Ballanco wrote: On Wed, Aug 08, 2012 at 09:19:15AM +, Samuel Lê wrote: Dear all, I am trying to write some code that would take a function name, get its source code, and create a new function based on the source code. Unfortunately, the function 'source' from clojure.repl doesn't seem to be working for the functions I define. Here is my code: (ns test-src.core (:require [clojure.repl])) (defn my-function [x] (+ x 1)) (defn print-src [] (println (clojure.repl/source my-function))) Try: (defn print-src [] (println (with-out-str (clojure.repl/source my-function The source method is designed for the REPL, and so dumps to *out* by default (you can confirm this yourself, appropriately enough, by doing (source source)) Cheers, Josh -- Joshua Ballanco ELC Technologies™ 1771 NW Pettygrove Street, Suite 140 Portland, OR, 97209 jbal...@elctech.com P +1 866.863.7365 F +1 877.658.6313 M +1 646.463.2673 T +90 533.085.5773 http://www.elctech.com -- 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 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
Re: core.cache 0.6.2 is not available from Central
Given that regular Clojure users cannot submit a pull request. Really? That's what I did... On 9 August 2012 06:56, Michael Klishin michael.s.klis...@gmail.com wrote: Meikel Brandmeyer: This does not necessarily include a specific version. “Instructions for including the library as a dependency in Maven / Leiningen” Arguing just for the sake of it? Clojure learning curve is already steep enough. Lets make it even steeper by asking people to figure out UIs of all those Maven search resources and which version is the last and whether using -SNAPSHOT versions is safe. Don't make me think is a good rule to live by for library maintainers. MK mich...@defprotocol.org -- 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 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
Re: Attractive examples of function-generating functions
On Aug 8, 2012, at 2:50 PM, Timothy Baldridge wrote: I'm not sure if this is exactly what you're looking for, but this sort of thing is pretty cool: (defn make-point [x y] (fn [member] (cond (= member :x) x (= member :y) y))) I actually have a whole chapter on this. (Arguably, the whole first part of the book leads up to that chapter.) I even use Point as an example! But it's functions all the way down! is not what I'm looking for in this section. Because you wouldn't use such a scheme instead of conventional objects. - Brian Marick, Artisanal Labrador Contract programming in Ruby and Clojure Occasional consulting on Agile -- 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
Re: Attractive examples of function-generating functions
On Aug 8, 2012, at 1:50 PM, Timothy Baldridge tbaldri...@gmail.com wrote: I'm looking for medium-scale examples of using function-generating functions. I'm not sure if this is exactly what you're looking for, but this sort of thing is pretty cool: (defn make-point [x y] (fn [member] (cond (= member :x) x (= member :y) y))) Nice. I always enjoyed this variation on the whole make-point theme: (defn make-point [x y] (fn [f] (f x y))) (defn point-x [pt] (pt (fn [x y] x))) (defn point-y [pt] (pt (fn [x y] y))) (def pt (make-point 1 2)) (println [(point-x pt) (point-y pt)]) -- -- Jim Weirich -- jim.weir...@gmail.com -- 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
Re: core.cache 0.6.2 is not available from Central
On Wed, Aug 8, 2012 at 5:58 PM, Andreas Kostler andreas.koest...@leica-geosystems.com wrote: Given that regular Clojure users cannot submit a pull request. Really? That's what I did... Technically you can _submit_ pull requests but Clojure and contrib projects cannot _accept_ them. You will generally see the pull request closed with a polite note to go read the Clojure contributing page and a request to sign a Contributor's Agreement and send that in. I tend to reply to most contrib pull requests I see across the board but may missed one or two. Which library did you submit a pull request against? We'd turn the feature off if we could. We've turned issues off on all the contrib repositories (which is why the standard format readme includes a link to the JIRA bug tracker for the project). -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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
Re: Attractive examples of function-generating functions
Maybe SICP's simulator of digital circuits will provide some inspiration. I know when I read this I was deeply awed by what HOFs can do. Maybe Clojure's zippers would be good too? On Wednesday, August 8, 2012 12:48:23 PM UTC-4, Brian Marick wrote: I'm looking for medium-scale examples of using function-generating functions. I'm doing it because examples like this: (def make-incrementer (fn [increment] (fn [x] (+ increment x ... or this: (def incish (partial map + [100 200 300])) ... show the mechanics, but I'm looking for examples that would resonate more with an object-oriented programmer. Such examples might be ones that close over a number of values (which looks more like an object), or generate multiple functions that all close over a shared value (which looks more like an object), or use closures to avoid the need to have some particular argument passed from function to function (which looks like the `this` in an instance method). Note: please put the flamethrower down. I'm not saying that looking like objects is the point of higher-order functions. I'll give full credit. - Brian Marick, Artisanal Labrador Contract programming in Ruby and Clojure Occasional consulting on Agile -- 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
Re: Question on Clojure/Heroku deployment
I don't think it's possible to get that error if you have a top-level project.clj file, but if you send a tarball of the project to phil.hagelb...@heroku.com I can take a look. Thanks Phil, I sent you a mail. Shantanu -- 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
Re: Attractive examples of function-generating functions
On Wed, Aug 08, 2012 at 08:00:26PM -0600, Jim Weirich wrote: On Aug 8, 2012, at 1:50 PM, Timothy Baldridge tbaldri...@gmail.com wrote: I'm looking for medium-scale examples of using function-generating functions. I'm not sure if this is exactly what you're looking for, but this sort of thing is pretty cool: (defn make-point [x y] (fn [member] (cond (= member :x) x (= member :y) y))) Nice. I always enjoyed this variation on the whole make-point theme: (defn make-point [x y] (fn [f] (f x y))) (defn point-x [pt] (pt (fn [x y] x))) (defn point-y [pt] (pt (fn [x y] y))) (def pt (make-point 1 2)) (println [(point-x pt) (point-y pt)]) -- -- Jim Weirich -- jim.weir...@gmail.com Very nice. Similarly, I thought it was slick when I saw this idea used as an example implementation for cons. Funny enough, it's exactly the same except for the names. (defn cons [a b] (fn [f] (f a b))) (defn car [xs] (xs (fn [a b] a))) (defn cdr [xs] (xs (fn [a b] b))) 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
Re: Attractive examples of function-generating functions
On 8/8/12 10:48 AM, Brian Marick wrote:
I'm looking for medium-scale examples of using function-generating functions.
I'm doing it because examples like this:
(def make-incrementer
(fn [increment]
(fn [x] (+ increment x
... or this:
(def incish (partial map + [100 200 300]))
... show the mechanics, but I'm looking for examples that would resonate more
with an object-oriented programmer. Such examples might be ones that close over
a number of values (which looks more like an object), or generate multiple
functions that all close over a shared value (which looks more like an object),
or use closures to avoid the need to have some particular argument passed from
function to function (which looks like the `this` in an instance method).
Note: please put the flamethrower down. I'm not saying that looking like
objects is the point of higher-order functions.
I'll give full credit.
Oh, I have the perfect one that I actually had to write the other day.
(The funny thing was that I wrote the exact same functionality in Ruby
several years ago.. I like the clojure version much better). I'll let
the code and midje facts speak for themselves:
;; some context: http://en.wikipedia.org/wiki/Urn_problem
(defn urn
Takes a coll of pairs representing a distribution with keys being
the probability of the corresponding values.
Returns a function that when called will return a random value based on
that distribution.
Example:
(def multimnomial-urn (urn [[0.3 :red] [0.5 :black] [0.2 :green]]))
(take 5 (repeatedly multimnomial-urn)) = [:red :black :black :red :green]
[dist]
{:pre [(= 1.0 (reduce + (map first dist)))]}
(let [range-dist (last (reduce (fn [[total pseudo-cdf] [percent val]]
(let [new-total (+ percent total)]
[new-total (assoc pseudo-cdf
new-total val)]))
[0.0 (sorted-map)]
dist))]
(fn []
;; TODO: use a better PRNG
(let [rn (rand)]
(val (find-first #( rn (key %)) range-dist))
;;; test code
(ns foo.core-test
(:use midje.sweet
foo.core
[useful.map :only [map-vals]]))
(defn ratios [m]
(let [freqs (frequencies m)
total (reduce + (vals freqs))]
(map-vals freqs #(/ % total
(defn percentages [m]
(- m ratios (map-vals double)))
(facts '#urn
(let [rand-key (urn [[0.3 :foo] [0.7 :bar]])]
(percentages (repeatedly 100 rand-key)) = (just {:foo (roughly 0.3
0.1)
:bar (roughly 0.7
0.1)})))
;;; end code
Hopefully I understood the question and this helps some. For an example
in a book you could make it a bit simpler where the urn could only
contain two potential values (binomial urn).
-Ben
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