Re: All subsets of a vector
On Nov 9, 2:47 pm, Shoeb Bhinderwala shoeb.bhinderw...@gmail.com wrote: ([a] [a b] [a b c] [a b c d]) It should be pointed out that this result -- while it may be what you actually want -- is not all subsets of [a b c d]. For that you might want to use combinatorics/subsets: user= (C/subsets [a b c d]) (() (a) (b) (c) (d) (a b) (a c) (a d) (b c) (b d) (c d) (a b c) (a b d) (a c d) (b c d) (a b c d)) -- 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
All subsets of a vector
Is there a more elegant/idomatic way to achieve the following result: user= a1 [a b c d] user= (map-indexed (fn [n x] (vec (take (inc n) x))) (take (count a1) (repeat a1))) ([a] [a b] [a b c] [a b c d]) -- 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: All subsets of a vector
(map #(vec (take (inc %) a1)) (range (count a1))) does it the lovely map. /Linus 2011/11/9 Shoeb Bhinderwala shoeb.bhinderw...@gmail.com Is there a more elegant/idomatic way to achieve the following result: user= a1 [a b c d] user= (map-indexed (fn [n x] (vec (take (inc n) x))) (take (count a1) (repeat a1))) ([a] [a b] [a b c] [a b c d]) -- 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: All subsets of a vector
Does Clojure have the equivalent of Haskell's 'scan' function? (I am on my phone...) Seems like a solution with that would be nice. (scan is like reduce except it keeps all intermediate results) On Nov 9, 2011 5:57 PM, Linus Ericsson oscarlinuserics...@gmail.com wrote: (map #(vec (take (inc %) a1)) (range (count a1))) does it the lovely map. /Linus 2011/11/9 Shoeb Bhinderwala shoeb.bhinderw...@gmail.com Is there a more elegant/idomatic way to achieve the following result: user= a1 [a b c d] user= (map-indexed (fn [n x] (vec (take (inc n) x))) (take (count a1) (repeat a1))) ([a] [a b] [a b c] [a b c d]) -- 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 -- 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: All subsets of a vector
Another way to do it, using 'reductions': (rest (reductions conj [] a1)) On Wednesday, November 9, 2011 5:47:08 PM UTC-5, Shoeb Bhinderwala wrote: Is there a more elegant/idomatic way to achieve the following result: user= a1 [a b c d] user= (map-indexed (fn [n x] (vec (take (inc n) x))) (take (count a1) (repeat a1))) ([a] [a b] [a b c] [a b c d]) -- 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: All subsets of a vector
That's exactly what 'reductions' does :) On Wednesday, November 9, 2011 6:09:08 PM UTC-5, Alex Baranosky wrote: Does Clojure have the equivalent of Haskell's 'scan' function? (I am on my phone...) Seems like a solution with that would be nice. (scan is like reduce except it keeps all intermediate results) On Nov 9, 2011 5:57 PM, Linus Ericsson oscarlinu...@gmail.com wrote: (map #(vec (take (inc %) a1)) (range (count a1))) does it the lovely map. /Linus 2011/11/9 Shoeb Bhinderwala shoeb.bh...@gmail.com Is there a more elegant/idomatic way to achieve the following result: user= a1 [a b c d] user= (map-indexed (fn [n x] (vec (take (inc n) x))) (take (count a1) (repeat a1))) ([a] [a b] [a b c] [a b c d]) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@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+u...@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 clo...@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+u...@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: All subsets of a vector
Dang, I just logged in in-flight just so I could post my solution with reductions :) (defn doit [coll] (rest (reductions conj [] coll))) -- 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: All subsets of a vector
Or my current favorite take-while iterate combo: C:\clojure-1.2.0java -jar clojure.jar Clojure 1.2.0 user= (take-while seq (iterate rest [1 2 3 4])) ([1 2 3 4] (2 3 4) (3 4) (4)) user= (take-while seq (iterate butlast [1 2 3 4])) ([1 2 3 4] (1 2 3) (1 2) (1)) user= On Nov 9, 4:52 pm, Alex Baranosky alexander.barano...@gmail.com wrote: Dang, I just logged in in-flight just so I could post my solution with reductions :) (defn doit [coll] (rest (reductions conj [] coll))) -- 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
