Re: JDBC Timezone Issue
Given that the patch just provides a way for users to tell the library these columns are special, it seems like you might just as well map a column adjustment function over the result set yourself? It feels very clunky. The JDBC library requires us to treat these columns special. If we don't call the right getter function, then it will return the wrong Date instance. It is very clunky to use Date instances created in the wrong timezone. It also looks like it can reorder columns. These special columns will only get inserted into the regular map at the end, but after all, it's a regular map and this will only happen if we make these columns special by passing in the optional parameter. The patch is fully backward compatible. Overall, I still think this problem arises because you're not following best practices for managing timezones which is to have all your servers operating on the same timezone and using NTP to sync times What if I am using the JDBC library in a client software instead of being in the server? On Tuesday, 31 July 2012 12:22:23 UTC+8, Sean Corfield wrote: On Fri, Jul 27, 2012 at 10:42 AM, Jestine Paul jestin...@gmail.comjavascript: wrote: I have raised a JIRA issue (JDBC-35) regarding the timezones returned from the ResultSet getter method. http://dev.clojure.org/jira/browse/JDBC-35 I'm a bit surprised no one has responded to this. Maybe no one else is having this issue? I'd love to see some feedback on this. I have also attached a patch to this issue. http://dev.clojure.org/jira/secure/attachment/11394/resultset-timezone.diff I hope there are better solutions suggested. Given that the patch just provides a way for users to tell the library these columns are special, it seems like you might just as well map a column adjustment function over the result set yourself? It feels very clunky. It also looks like it can reorder columns. java.jdbc used to use structmap to preserve column order but now uses regular maps - although small maps use an array map which does in fact preserve column ordering for reasonable numbers of columns. That didn't seem to be particularly important for users at the time but gratuitous partitioning of columns seems unnecessary... Overall, I still think this problem arises because you're not following best practices for managing timezones which is to have all your servers operating on the same timezone and using NTP to sync times - but I really do want to hear some feedback from other java.jdbc users (which is why I haven't just closed the ticket). -- 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
If you like Midje you should probably stick with it. The two libraries were designed with very different goals in mind. Midje is much more polished and targeted adoption early on. expectations was created for testing the application I was working on, made available on github, but never really promoted. If it suits your testing style, you should love it. If not, you'll likely hate it - it's very opinionated. Check out the github page and look at the success examples that are linked. That will cost you less than 5 minutes, and should give you all the information you need to decide which you prefer. Cheers, Jay Sent from my iPhone On Aug 8, 2012, at 9:28 PM, keeds akee...@gmail.com wrote: 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 -- 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
drawing a chess-board with seesaw ...
Hey all, Spent most of yesterday trying to draw a chessboard on a paintable canvas, however I'm stuck after drawing the lines of the grid...I mean the grid is there but its all one colour (the background colour of the panel)! The fn that draws the lines is simply this: (defn draw-grid [c g] (let [w (width c) h (height c)] (doseq [x (range 0 w 50)] (.drawLine g x 0 x h)) (doseq [y (range 0 h 50)] (.drawLine g 0 y w y Does anyone have any suggestions as to how to do the black-white alteration on the grid? I know how to do it imperatively using loop(s) and a couple of flags but I'm really struggling to tweak the 'draw-grid' accordingly to paint the colours as well... Any seesaw gurus? - please help... cheers, Jim -- 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: drawing a chess-board with seesaw ...
How about drawing all the rectangles with .fillRect()http://docs.oracle.com/javase/7/docs/api/java/awt/Graphics.html#fillRect%28int,%20int,%20int,%20int%29and before each call alternate between black and white by calling .setColor()http://docs.oracle.com/javase/7/docs/api/java/awt/Graphics.html#setColor%28java.awt.Color%29. You can alternate between the colours by taking the first of the following seq every time you set the color: (cycle [java.awt.Color.black java.awt.Color.white]) Stathis On Thursday, 9 August 2012 09:37:48 UTC+1, Jim foo.bar wrote: Hey all, Spent most of yesterday trying to draw a chessboard on a paintable canvas, however I'm stuck after drawing the lines of the grid...I mean the grid is there but its all one colour (the background colour of the panel)! The fn that draws the lines is simply this: (defn draw-grid [c g] (let [w (width c) h (height c)] (doseq [x (range 0 w 50)] (.drawLine g x 0 x h)) (doseq [y (range 0 h 50)] (.drawLine g 0 y w y Does anyone have any suggestions as to how to do the black-white alteration on the grid? I know how to do it imperatively using loop(s) and a couple of flags but I'm really struggling to tweak the 'draw-grid' accordingly to paint the colours as well... Any seesaw gurus? - please help... cheers, Jim -- 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: drawing a chess-board with seesaw ...
On 09/08/12 10:08, Stathis Sideris wrote: How about drawing all the rectangles with .fillRect() http://docs.oracle.com/javase/7/docs/api/java/awt/Graphics.html#fillRect%28int,%20int,%20int,%20int%29 and before each call alternate between black and white by calling .setColor() http://docs.oracle.com/javase/7/docs/api/java/awt/Graphics.html#setColor%28java.awt.Color%29. You can alternate between the colours by taking the first of the following seq every time you set the color: (cycle [java.awt.Color.black java.awt.Color.white]) Stathis Geia sou Stathi, If I understood correctly, you propose filling rectangles instead of drawing lines...that is a good idea but how would I alternate the colors using 'cycle'? 'cycle' returns a infinitely cycled lazy-seq of the provided collection. Whenever i call 'first' on it I get the same value back...they are not alternating! Have I misunderstood? thanks for bothering btw... :-) Jim (Dimitris) -- 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: drawing a chess-board with seesaw ...
On 09/08/12 11:17, Jim - FooBar(); wrote: On 09/08/12 10:08, Stathis Sideris wrote: How about drawing all the rectangles with .fillRect() http://docs.oracle.com/javase/7/docs/api/java/awt/Graphics.html#fillRect%28int,%20int,%20int,%20int%29 and before each call alternate between black and white by calling .setColor() http://docs.oracle.com/javase/7/docs/api/java/awt/Graphics.html#setColor%28java.awt.Color%29. You can alternate between the colours by taking the first of the following seq every time you set the color: (cycle [java.awt.Color.black java.awt.Color.white]) Stathis Geia sou Stathi, If I understood correctly, you propose filling rectangles instead of drawing lines...that is a good idea but how would I alternate the colors using 'cycle'? 'cycle' returns a infinitely cycled lazy-seq of the provided collection. Whenever i call 'first' on it I get the same value back...they are not alternating! Have I misunderstood? thanks for bothering btw... :-) Jim (Dimitris) aaa ok sorry...you mean having it as doseq binding...that makes sense! I apologise for rushing... Jim -- 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: drawing a chess-board with seesaw ...
On 09/08/12 11:23, Jim - FooBar(); wrote: aaa ok sorry...you mean having it as doseq binding...that makes sense! I apologise for rushing... Jim No I can't put 'cycle' inside a doseq cos its trying to consume it! Jim -- 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: drawing a chess-board with seesaw ...
You can try using the multi-input version of map to knit your data together with some other, potentially infinite, sequence: (map vector items (cycle [black white])) It returns something like this: ([item1 black] [item2 white] [item3 black] [item4 white]) Then you can use doseq over that, using destructuring to pick apart the items and colours and do something appropriate with each of them. -- Dave On Thu, Aug 9, 2012 at 11:53 AM, Jim - FooBar(); jimpil1...@gmail.com wrote: On 09/08/12 11:23, Jim - FooBar(); wrote: aaa ok sorry...you mean having it as doseq binding...that makes sense! I apologise for rushing... Jim No I can't put 'cycle' inside a doseq cos its trying to consume it! Jim -- 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: drawing a chess-board with seesaw ...
On 09/08/12 12:00, David Powell wrote: You can try using the multi-input version of map to knit your data together with some other, potentially infinite, sequence: (map vector items (cycle [black white])) It returns something like this: ([item1 black] [item2 white] [item3 black] [item4 white]) Then you can use doseq over that, using destructuring to pick apart the items and colours and do something appropriate with each of them. Thanks Dave that is pretty clever and looks very idiomatic! I managed to get what I by using your suggestion: (defn draw-grid2 [d g] (let [w (width d) h (height d) tiles (map vector (for [x (range 0 w 50) y (range 0 h 50)] [x y]) (cycle [java.awt.Color/WHITE java.awt.Color/BLACK]))] (doseq [[[x y] c] tiles] (.setColor g c) (.fillRect g x y 50 50)) )) Thanks a lot! It looked impossible to achieve without mutation, indices and counting pixels!!! Jim -- 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 use quite a few of these in my Overtone rendering of
Bachhttp://skillsmatter.com/podcast/home/functional-composition
:
; Defining a scale function from intervals
(defn sum-n [series n] (reduce + (take n series)))
(defn scale [intervals]
(fn [degree]
(if-not (neg? degree)
(sum-n (cycle intervals) degree)
((comp - (scale (reverse intervals)) -) degree
(def major (scale [2 2 1 2 2 2 1]))
(major 2)
; Defining a time function
(defn bpm [beats] (fn [beat] (- beat (/ beats) (* 60) (* 1000
((bpm 90) 3)
; Defining a simple canon (like row, row, row your boat)
(defn canon [f] (fn [notes] (concat notes (f notes
(defn shift [point] (fn [notes] (map #(- % (map + point) vec) notes)))
(defn simple [wait] (shift [wait 0]))
(canon (simple 4))
Code's on
githubhttps://github.com/ctford/goldberg/blob/SkillsMatter-2012/src/goldberg/variations/canone_alla_quarta.clj
.
Cheers,
Chris
On 9 August 2012 05:44, Ben Mabey b...@benmabey.com wrote:
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_problemhttp://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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Is this expected of seesaw ?
Hi again, I'm having a couple of issues with seesaw and I'd like to see the community's experience with it... 1. First of all, my lein repl hangs each time I reload a namespace that uses seesaw.core. Not when I first load it (load-file blah...blah), but when I reload it after some changes...this is really a problem as I need to kill/restart leiningen after every change in the code! This completely defeats the purpose of dynamic compilation... 2. Secondly, whenever I was designing UIs in clojure I quite liked the ability to change the frame (e.g. resizing) dynamically from the repl while changes are immediately shown on screen...That saves a lot of time when experimenting. Now, the 'frame' function of seesaw does not exactly return a JFrame but a proxied version on to which, apparently, I cannot call (.setSize f 500 500) directly...I am suspecting there must be some easy way to get around that yes? Just so we're clear, question #1 is the important one... Thanks in advance, Jim -- 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: Is this expected of seesaw ?
Hi, Am Donnerstag, 9. August 2012 14:10:55 UTC+2 schrieb Jim foo.bar: 1. First of all, my lein repl hangs each time I reload a namespace that uses seesaw.core. Not when I first load it (load-file blah...blah), but when I reload it after some changes...this is really a problem as I need to kill/restart leiningen after every change in the code! This completely defeats the purpose of dynamic compilation... Never had any problem here. At least not with seesaw. I don't know lein. 1. Secondly, whenever I was designing UIs in clojure I quite liked the ability to change the frame (e.g. resizing) dynamically from the repl while changes are immediately shown on screen...That saves a lot of time when experimenting. Now, the 'frame' function of seesaw does not exactly return a JFrame but a proxied version on to which, apparently, I cannot call (.setSize f 500 500) directly...I am suspecting there must be some easy way to get around that yes? (config! your-frame :size [x :by y]) Seems to work for me from the repl. (Maybe with some (invoke-later ...)?) 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: drawing a chess-board with seesaw ...
Yeah, sorry Dimitri, I wasn't very clear :-) I meant that if you were going to do it recursively you would be using the first element of the seq, and you would be passing the (rest) of the seq to the subsequent recursive call. Very elegant solution! On Thursday, 9 August 2012 12:29:12 UTC+1, Jim foo.bar wrote: On 09/08/12 12:00, David Powell wrote: You can try using the multi-input version of map to knit your data together with some other, potentially infinite, sequence: (map vector items (cycle [black white])) It returns something like this: ([item1 black] [item2 white] [item3 black] [item4 white]) Then you can use doseq over that, using destructuring to pick apart the items and colours and do something appropriate with each of them. Thanks Dave that is pretty clever and looks very idiomatic! I managed to get what I by using your suggestion: (defn draw-grid2 [d g] (let [w (width d) h (height d) tiles (map vector (for [x (range 0 w 50) y (range 0 h 50)] [x y]) (cycle [java.awt.Color/WHITE java.awt.Color/BLACK]))] (doseq [[[x y] c] tiles] (.setColor g c) (.fillRect g x y 50 50)) )) Thanks a lot! It looked impossible to achieve without mutation, indices and counting pixels!!! Jim -- 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: Is this expected of seesaw ?
On 09/08/12 13:39, Meikel Brandmeyer (kotarak) wrote: (config! your-frame :size [x :by y]) yep! that does the trick... thanks a lot Meikel! are you 'using' or 'requiring' seesaw.core in your projects? the same thing happens (repl hangs) when i cose my frame and try to open up a new one! this is weird yes? Jim -- 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
Why does (conj (transient {}) {}) fail with CCE?
Hi,
I've been digging into the sources of Clojure and found frequencies.
There's the transient function and I thought I'd use it with a map and
conj. Why does this fail?
user= (conj {} {:y 1})
{:y 1}
user= (conj (transient {}) {:y 1})
ClassCastException [trace missing]
I ran into the issue before and got a more comprehensible exception.
ClassCastException clojure.lang.PersistentArrayMap$TransientArrayMap
cannot be cast to clojure.lang.IPersistentCollection
clojure.core/conj (core.clj:83)
I can't explain why the exception is reported in two different versions.
Should the exception be thrown? What's the rationale behind
TransientArrayMap *not* being a IPersistentCollection?
Jacek
--
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Functional languages (Clojure), Java EE, and IBM WebSphere -
http://blog.japila.pl
Never discourage anyone who continually makes progress, no matter how
slow. Plato
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Re: Why does (conj (transient {}) {}) fail with CCE?
you must use conj! instead of conj.
在 2012-8-9 PM8:49，Jacek Laskowski ja...@japila.pl写道：
Hi,
I've been digging into the sources of Clojure and found frequencies.
There's the transient function and I thought I'd use it with a map and
conj. Why does this fail?
user= (conj {} {:y 1})
{:y 1}
user= (conj (transient {}) {:y 1})
ClassCastException [trace missing]
I ran into the issue before and got a more comprehensible exception.
ClassCastException clojure.lang.PersistentArrayMap$TransientArrayMap
cannot be cast to clojure.lang.IPersistentCollection
clojure.core/conj (core.clj:83)
I can't explain why the exception is reported in two different versions.
Should the exception be thrown? What's the rationale behind
TransientArrayMap *not* being a IPersistentCollection?
Jacek
--
Jacek Laskowski
Functional languages (Clojure), Java EE, and IBM WebSphere -
http://blog.japila.pl
Never discourage anyone who continually makes progress, no matter how
slow. Plato
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Re: Why does (conj (transient {}) {}) fail with CCE?
On Thu, Aug 9, 2012 at 6:19 PM, Jacek Laskowski ja...@japila.pl wrote: What's the rationale behind TransientArrayMap *not* being a IPersistentCollection? A transient map can't be a persistent map at the same time. You need to use the transient version of conj, called conj! to conjoin something into a transient map and then use persistent! to get a persistent version back. Please read the documentation for more background http://clojure.org/Transients Regards, BG -- 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
New to Clojure, need some help
I am trying to remove every occurrence of a given element from a vector. I can use (filter #(== % a) v) where 'a' is the value to be removed and 'v' is the vector, but this returns 'a' and 'a' is the value i want to remove. So, how can i do this? I tried replacing 'filter' with 'remove' but it didn't like that. Also, can anyone tell me why != is not included for equality testing, that would make this problem easy. Thanks, Jason. P.S. I also need to be able replicate the problem, but instead of removing a single item from the vector, I need to remove a list of items from the vector. I know I'm going to have to do some looping or recursing, but any help would be appreciated. Thanks -- 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: New to Clojure, need some help
Hi,
Does this work for you?
(remove #{:a} [:a :b :a :c :d :e])
Also, if you have a list of items you can have all of them in the same
set/predicate like so -
(remove #{:a :z :x} [:a :b :a :c :d :e :z :b :d :e :x :z])
Hope this helps.
Regards,
BG
On Thu, Aug 9, 2012 at 10:11 AM, Jason Long jsnl...@gmail.com wrote:
I am trying to remove every occurrence of a given element from a vector. I
can use (filter #(== % a) v) where 'a' is the value to be removed and 'v' is
the vector, but this returns 'a' and 'a' is the value i want to remove. So,
how can i do this? I tried replacing 'filter' with 'remove' but it didn't
like that. Also, can anyone tell me why != is not included for equality
testing, that would make this problem easy.
Thanks, Jason.
P.S. I also need to be able replicate the problem, but instead of removing a
single item from the vector, I need to remove a list of items from the
vector. I know I'm going to have to do some looping or recursing, but any
help would be appreciated. Thanks
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Re: New to Clojure, need some help
To clarify Baishampayan's code, hash-sets in Clojure are functions:
= (#{1} 1)
1
= (#{1} 2)
nil
Nil and false in Clojure are the same thing,
So Baishampayan's example:
(remove #{:a :z :x} [:a :b :a :c :d :e :z :b :d :e :x :z])
#{:a :z : x} will return nil if the value is not in the vector, nil is
considered false, and so the not found value is removed from the seq.
Timothy
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Re: New to Clojure, need some help
On Thu, Aug 9, 2012 at 10:11 AM, Jason Long jsnl...@gmail.com wrote: Also, can anyone tell me why != is not included for equality testing, that would make this problem easy. To answer your other question, != in Clojure is called not= Regards, BG -- 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: Is this expected of seesaw ?
Hi, Am Donnerstag, 9. August 2012 14:43:57 UTC+2 schrieb Jim foo.bar: are you 'using' or 'requiring' seesaw.core in your projects? I usually do (require '[seesaw.core :as swing]). the same thing happens (repl hangs) when i cose my frame and try to open up a new one! this is weird yes? Never had any problems. But you have to pay attention to the event dispatch thread. Maybe threre is some conflict there. (Just a guess. Cargo cult.) 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: Clojure group in DFW area
The group hasn't met in a long time, but we were actually talking about some kind of a relaunch last week. We were hoping some Clojure interest had increased in the DFW area since we tried last time. Anyone else in the DFW area interested in getting together? Alex On Tue, Aug 7, 2012 at 11:09 AM, VishK svko...@gmail.com wrote: 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 -- 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
reduce-kv doesn't reduce a sorted-map in order
Hi,
It seems reduce-kv doesn't reduce a sorted-map in the correct order.
Example -
user (def *sm (into (sorted-map) {:aa 1 :zz 2 :bb 3 :yy 4 :cc 5 :xx 6}))
;= #'user/*sm
user *sm
;= {:aa 1, :bb 3, :cc 5, :xx 6, :yy 4, :zz 2}
;; plain reduce
user (reduce (fn [ret e] (conj ret e)) [] *sm)
;= [[:aa 1] [:bb 3] [:cc 5] [:xx 6] [:yy 4] [:zz 2]] ; correct
;; reduce-kv
user (reduce-kv (fn [ret k v] (conj ret [k v])) [] *sm)
;= [[:cc 5] [:bb 3] [:aa 1] [:yy 4] [:xx 6] [:zz 2]] ; incorrect
Is this a bug?
Regards,
BG
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Re: Why does (conj (transient {}) {}) fail with CCE?
On Thu, Aug 9, 2012 at 2:54 PM, Baishampayan Ghose b.gh...@gmail.com wrote: A transient map can't be a persistent map at the same time. You need to use the transient version of conj, called conj! to conjoin something into a transient map and then use persistent! to get a persistent version back. Please read the documentation for more background http://clojure.org/Transients Thanks! It's so much clearer now. Jacek -- Jacek Laskowski Functional languages (Clojure), Java EE, and IBM WebSphere - http://blog.japila.pl Never discourage anyone who continually makes progress, no matter how slow. Plato -- 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
Ideas for interactive tasks
Hello I'm going to organize little clojure course at my university this year. For this I want to implement set of tasks that hopefully will help to practise clojure. Tasks will be animated so students can see how their solutions work. E.g. one of the tasks is to hit plane by missile: there is a plane that flies from left to the right with fixed speed. Player launches missile to hit the plane. Task is to write a function that takes coordinates of plane and player and returns angle for launching missile. Plane's and missile's speeds are constant and known. This task requires math and basic clojure knowledge (only perform math operations, use let, if, Math/* functions). Another example is to implement a bot for snake. Bot is implemented as a function that takes snakes position (sequence of cells, each cell is vector of 2 values) and apple position (vector of 2 values). Function must return what direction to move. This task requires using of clojure seq functions. Can somebody propose ideas for this kind of tasks? I'm particularly interested in tasks that require different fields of clojure, e.g. I don't know what to implement for learning atoms, refs and agends. Examples of tasks (artillery and snake) can be found here: https://github.com/nbeloglazov/clojure-interactive-tasks. I use quil https://github.com/quil/quilfor animation. Animation is primitive in the tasks (I'm not particularly good at it). Thank you, Nikita Beloglazov -- 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: Ideas for interactive tasks
On 09/08/12 16:21, Nikita Beloglazov wrote: I'm going to organize little clojure course at my university this year. this is amazing! seriously, bravo! what university is this? Jim -- 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: Ideas for interactive tasks
Thank you, Jim. This is Belarusian State University. On Thu, Aug 9, 2012 at 6:23 PM, Jim - FooBar(); jimpil1...@gmail.comwrote: On 09/08/12 16:21, Nikita Beloglazov wrote: I'm going to organize little clojure course at my university this year. this is amazing! seriously, bravo! what university is this? Jim -- 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+unsubscribe@**googlegroups.comclojure%2bunsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/**group/clojure?hl=enhttp://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: Clojure group in DFW area
I just moved to the DFW area, and I'm curious about these meetings as well. Is anything going on with them? On Tuesday, August 7, 2012 11:09:05 AM UTC-5, VishK wrote: 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
Re: basic question , clojure io
No, there is no language-level distinction between pure functions and functions which perform side effects. In practice, it is a good idea to keep them separate. -S On Tuesday, August 7, 2012 9:37:31 AM UTC-4, centaurian_slug wrote: 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: Attractive examples of function-generating functions
On Wednesday, August 8, 2012 6:48:23 PM UTC+2, Brian Marick wrote:
... 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).
You can make objects with its state hidden in a closure. E.g. if we want to
make a stack where people cannot look at any other element than the first
one, we can do that like this:
(letfn [(stack-fns [stack]
{:push (fn [elt] (stack-fns (conj stack elt)))
:pop (fn [] (stack-fns (pop stack)))
:peek (fn [] (peek stack))
:empty? (fn [] (empty? stack))})]
(defn new-stack []
(stack-fns [])))
Usage would be like this:
(let [stack (reduce
#((%1 :push) %2)
(new-stack)
(range 1 10))] ; To fill it with data
(loop [stack stack]
(if ((stack :empty?))
nil
(let [h ((stack :peek))
t ((stack :pop))]
(prn h)
(recur t)
And this will print the numbers 9 to 1, before returning nil.
The Joy of Clojure looks at this from p. 138 to 141, so I take no credit
for the idea - give that to the authors.
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Re: Attractive examples of function-generating functions
You've probably seen these, but if not, Doug Crockford's video series on javascript walks through a number of interesting information sharing examples like the ones you're looking for using fn-generating-fns- http://yuiblog.com/crockford/ They're all great but act 3 - function the ultimate is especially juicy. The motivation for his examples is a little different than it would be for clojure, because that pattern is basically javascript's only abstraction trick. And certainly the semantics are different too. But if for whatever reason you haven't seen these videos, they're terrific and will probably spur some ideas. On Wed, Aug 8, 2012 at 12:48 PM, Brian Marick mar...@exampler.com 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 -- 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
Hi Simone, You can look at the code made by Cory Giles at https://github.com/gilesc/factor-graph Good luck. Alexsandro 2012/7/14 Simone Mosciatti mweb@gmail.com 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 -- Alexsandro Santos Soares, Prof. Dr. Faculdade de Computação Universidade Federal de Uberlândia - UFU - Sala 1B123 +55 (0xx34) 3239-4478 -- 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
