Use of !! to access the lists by index

[werner291]

Hi,

thanks for this code! Gotta love Simpex noise.

I do have one suggestion though: [1,2,3] gives you a Haskell list. These are linked lists (not arrays), which means that calling !! i takes O(i).

Since your data doesn't change, you're probably better off using Vector, which gives O(1) indexing.

[werner291]

Also, you're likely getting Haskell arbitrary-size Integer types rather than just Int.