I have a 2D array to represent a many-many mapping :
0 3 1 3
3 0 0 0
1 0 0 0
3 0 0 0
What is the quickest way to 'zero' out rows and column entries corresponding to a particular index in this array?
arr[i] = 0 # zeroes out row i
arr[:,i] = 0 # zeroes out column i