18 May
2015
18 May
'15
7:23 a.m.
Hi All, I'm building a 9x9 grid like list, and I want to extract each column of that grid. My input is a list of integers as follows; input = [0, 0, 0, 0, 0, 0, 4, 0, 9, 0, 0, 0, 0, 8, 0, 0, 5, 0, 7, 0, 2, 4, 5, 3, 6, 0, 0, 6, 7, 0, 0, 0, 1, 5, 0, 2, 2, 0, 8, 7, 0, 4, 3, 0, 1, 9, 0, 4, 5, 0, 0, 0, 8, 6, 0, 0, 6, 3, 1, 9, 8, 0, 7, 0, 2, 0, 0, 7, 0, 0, 0, 0, 1, 0, 7, 0, 0, 0, 0, 0, 0] I tried list comprehension with 'take' function in lists as follows; columns xs = [x | x <- (take 1 xs)] : columns (drop 9 xs) --> columns input This extracts only the first column. How I can go for the other columns? -- Regards, Dananji Liyanage