Hello!
I have two lists of Double with equal length and want to create a
Dmitri Pissarenko wrote: third one,
in which each element is the sum of the corresponding element of the first list and the second list.
If list1 is [1, 2, 100] and list2 is [2, 3, 500], then the result of the operation I desire is [3, 5, 600].
zipWith (+) [1,2,100] [2,3,500]
I wrote this function
<function> add2Img :: [Double] -> [Double] -> [Double] add2Img summand1 summand2 = sum where sum = [ (x+y) | x <- summand1, y <- summand2 ] </function>,
This is intepreted as two nestes "loops": foreach x in summand1 (foreach y in summand2: x + y). You need zipWith. There is GHC extension: parallel list composition to do what you want. Lookup GHC documentation for extensions. -- Gracjan