Creating 2 dimensional list matrix

Question

How do you create a list-based matrix of 1\'s with given row and column counts? For example, like:

row=3,column=4 -> [[1,1,1,1],[1,1,1,1],[1,1,1         


        

Answer 1

import Control.Applicative
import Data.Functor 

matrix r c = [1] <* [1..c] <$ [1..r]