So a FAQ it was, and not an old one with that ;) Thanks a lot !
On 10 fév, 23:38, Timothy Pratley <timothyprat...@gmail.com> wrote:
> Hi PH,
>
> > "Returns a map of the elements of col to the evaluation of function
>
> (zipmap keys (map fun
> keys))http://groups.google.com/group/clojure/browse_thread/thread/8fe99ca56...
>
> If you are following Matt's suggestion of a sorted map though then you
> might need something a bit more complex:
> "(sorted-map-by comparator & keyvals)" where comparator would probably
> sort by x then y, you can generate you keyvals like so:
> (interleave keys (map fun keys))
>
> user=> (def ks [1 2 3])
> user=> (defn f [x] (+ x 1))
> user=> (apply sorted-map-by < (interleave ks (map f ks)))
> {1 2, 2 3, 3 4}
> user=> (zipmap ks (map f ks))
> {3 4, 2 3, 1 2}
>
> (note that < is not really necessary as is the default)
>
> There are lots of ways to construct maps eg:
> user=> (into {} [[1 2] [3 4]])
> {3 4, 1 2}
> user=> {1 2 3 4}
> {1 2, 3 4}
> user=> (hash-map 1 2 3 4)
> {1 2, 3 4}
>
> Regards,
> Tim.
>
> On Feb 11, 8:52 am, phtrivier <phtriv...@gmail.com> wrote:
>
> > Okay, can I ask exactly how you produce the map ? In my situation I
> > know how to compute whether a cell [i,j] is blocked, I can generate
> > the list of couples [i,j] that suits me ... and then I am stuck, not
> > knowing with function / macro to call. I guess it's just the same
> > problem as with cond, I am pretty sure their is a function that does
> > just that, but I don't have a clue how it's called ;) what I am
> > looking for is :
>
> > foobar [f col]
> > "Returns a map of the elements of col to the evaluation of function
> > f on each of them"
>
> > For some value of foobar ... I tried google all functions starting
> > with "Returns a map", but I had no luck .... it is some usage of map ?
> > of assoc itself in a way that I haven't tried ?
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