Re: [q-lang-users] composing or lambda?

[Eddie R. <ed...@bm...>]

Eddie Rucker,

Addendum (add this to the readability/performance question): I also just
discovered I don't need variables (although I saw something like this
somewhere in the docs):

addSurvey = zipwith (zipwith (+));
addSurveyId = map (mklist 0 . (#));

> I've go two lines in a program that computes stats on a file of surveys:
>
> addSurvey X Y = zipwith (zipwith (+)) X Y;
> addSurveyId A = map Id A where Id = (mklist 0) . (#);
>
> where X and Y are two lists with a 1 in the position of the student
> response, like [0,0,1,0,0], and each survey is a list of these lists.
>
> My question is:
> Does the "where" in addSurveyId compute "(mklist 0) . (#)" once and use
> the new function throughout the map operation? Or does map just put
> "(mklist 0) .(#)"  in front of each element in the list and then reduce?
>
> Second question:
> Which is better, readability and/or performance wise?
>
> "addSurveyId A = map (\X. mklist 0 (#X) A;"
>
> or
>
> "addSurveyId A = map ZeroVec A where ZeroVec = (mklist 0) . (#);"
>
> or
>
> "addSurveyId A = map (mklist 0 .(#)) A;"
>
> Eddie
>
>
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