Ah, so this is the context for your previous thread about multiplying
lists. Re-using some of the code from that thread:
(def target [[1 2 3 4] [2 3 4 5]])
(def signal [[[1 2 3 4] [2 3 4 5] [3 4 5 6]] [[2 3 4 5] [3 4 5 6] [4 5
6 7]]])
(defn correlate [target signal]
(let [mult-lists (fn [x y] (map * x y))
mult-list-by-lists (fn [l ls] (map #(mult-lists l %) ls))]
(map mult-list-by-lists target signal)))
user=> (correlate target signal)
(((1 4 9 16) (2 6 12 20) (3 8 15 24)) ((4 9 16 25) (6 12 20 30) (8 15
24 35)))
On Aug 23, 9:26 am, Glen Rubin <rubing...@gmail.com> wrote:
> I am trying to write a fn to correlate 2 signals using 3 nested map
> fn. I have 2 collections of data. THe first group of signals called
> target looks something like this.
>
> target:
> ( (1,2,3,4) (2,3,4,5) ...)
>
> The second collection is called signal and looks like this:
>
> signal:
> ( ((1,2,3,4)(2,3,4,5)(3,4,5,6)) ((2,3,4,5)(3,4,5,6)(4,5,6,7)) ... )
>
> I would like to take the first list in "target" and multiply it by
> every list in the first group of "signal". And then continue on
> processing the second list, etc...
>
> which would result in something like:
>
> ( ((1,4,9,16)(2,6,12,20)(3,8,15,24)) ((4,9,16,25) (6,12,20,30)
> (8,15,24,35)) ... )
>
> I try a nested map fns like this, but can't get it to work:
>
> (map #(map #(map * %1 %2) %1 %2) target signal)
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