How to make a checkerboard in numpy?

Question

I\'m using numpy to initialize a pixel array to a gray checkerboard (the classic representation for \"no pixels\", or transparent). It seems like there ought to be a whizzy

Answer 1

Suppose we need a patter with length and breadth (even number) as l, b.

base_matrix = np.array([[0,1],[1,0]])

As this base matrix, which would be used as a tile already has length and breadth of 2 X 2, we would need to divide by 2.

print np.tile(base_matrix, (l / 2, b / 2))

print (np.tile(base,(4/2,6/2)))
[[0 1 0 1 0 1]
 [1 0 1 0 1 0]
 [0 1 0 1 0 1]
 [1 0 1 0 1 0]]