Comments on: Counting occurences http://clj-me.cgrand.net/2009/04/27/counting-occurences/ When the pupil is ready to learn, a teacher will appear. Mon, 30 Jan 2012 20:57:36 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Tim McCormack http://clj-me.cgrand.net/2009/04/27/counting-occurences/comment-page-1/#comment-11953 Tim McCormack Mon, 21 Nov 2011 00:42:54 +0000 http://clj-me.cgrand.net/2009/04/27/counting-occurences/#comment-11953 My thought process on this would probably be something like: What does the final result need to look like? {:a 5, :b 1, :c 4} Can I build that up incrementally (as opposed to multiple passes)? Yes, given {:a 5, :b 1, :c 4} and another occurrence of :b, I can produce {:a 5, :b 2, :c 4}. Good, so no post-processing or multi-pass processing is needed. Is there a good initial condition? {} etc. My thought process on this would probably be something like:

What does the final result need to look like?
{:a 5, :b 1, :c 4}

Can I build that up incrementally (as opposed to multiple passes)?
Yes, given {:a 5, :b 1, :c 4} and another occurrence of :b, I can produce {:a 5, :b 2, :c 4}. Good, so no post-processing or multi-pass processing is needed.

Is there a good initial condition?
{}

etc.

]]> By: Alexandre Jasmin http://clj-me.cgrand.net/2009/04/27/counting-occurences/comment-page-1/#comment-6941 Alexandre Jasmin Mon, 04 Jul 2011 18:19:50 +0000 http://clj-me.cgrand.net/2009/04/27/counting-occurences/#comment-6941 I like your explanation. Couldn't be clearer. But it seems that clojure.core now has a (frequencies coll) function that does this. I like your explanation. Couldn’t be clearer.
But it seems that clojure.core now has a (frequencies coll) function that does this.

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