[q-lang-users] composing or lambda?

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

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