On Thursday 11 December 2008 06:33, Dave Griffith wrote:
> On Dec 11, 9:21 am, bOR_ <[EMAIL PROTECTED]> wrote:
> > Hi all,
> >
> > I thought I remembered there was a method in the api somewhere that
> > would count the frequency of each unique item in a collection, but
> > I can't find it anymore. What would be a brief way to write that in
> > clojure?
> >
> > (In ruby: array.inject(Hash.new(0)) {|hash,key| hash[key] += 1 ;
> > hash})
>
> (defn frequencies [coll]
> (reduce (fn [map val] (assoc map val (if (contains map val) (get map val)
> 1)) #{})
> )
Shooting from the hip, eh? There is no "contains", it's "contains?".
There's a missing close parenthesis. I don't see where this is doing any
counting. How does it compute occurrence frequencies?
Randall Schulz
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