Hi again,
I still don't know how to use the filter function.
I have a map of "provinces - seats" like: (def provs {"p1" "5", "p2"
"8", "p3" "13", "p4" "11"})
And a sequence of "province - party - votes" like: (def votes [["A"
"p1" "32"] ["B" "p1" "55"] ["A" "p2" "77"] ["B" "p2" "21"]])
In order to get the lazy sequence for every province, I have made a
function like: (defn getseq [prov party] (...))
But I don't know how to get each province ("p1", "p2", "p3", ...).
Doing: (take 1 provs)
I get: (["p1" "5"])
Any idea of how could I get "p1"? So I can make a recursive call to my
getseq function with "p1", "p2", ...
Thanks again.
On Dec 21, 2:21 am, Ken Wesson <kwess...@gmail.com> wrote:
> On Mon, Dec 20, 2010 at 5:05 PM, Anclj <anb...@gmail.com> wrote:
> > Thanks a lot for the fast reply!
> > Now I have the vector as I wanted.
>
> > I have been playing with your code: (map #(/ votes %) (iterate inc 1))
>
> > user=> (take 10 (map #(/ 100 %) (iterate inc 1)))
> > (100 50 100/3 25 20 50/3 100/7 25/2 100/9 10)
>
> > I have managed to put that in a lazy sequence:
> > user=> (def ls (lazy-seq (map #(/ 100 %) (iterate inc 1))))
> > #'user/ls
>
> Eh. (map #(/ votes %) (iterate inc 1)) itself produces a lazy
> sequence, since map and iterate are lazy.
>
> > I don't know how to filter and work with the vector & map in order to
> > apply that function for each party, in each province.
> > I have been trying to use the filter function but I get the following
> > error:
>
> > user=> (filter #"A" [["A" "p1" "32"] ["B" "p1" "55"] ["A" "p2" "77"]
> > ["B" "p2" "21"]])
> > java.lang.ClassCastException: java.util.regex.Pattern cannot be cast
> > to clojure.lang.IFn
>
> For this, you can just use #(= "A" %) as your predicate; there's no
> need to use regex matching.
>
> If you need a regex, use #(re-matches #"pattern" %) as your predicate,
> instead of the regex itself.
>
> > Thanks again and I will be posting any advances!
>
> You're welcome.
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