Delete element from multi-dimensional numpy array by value

Question

Given a numpy array

a = np.array([[0, -1, 0], [1, 0, 0], [1, 0, -1]])

what\'s the fastest way to delete all elements of value -1

Answer 1

How about this?

print([[y for y in x if y > -1] for x in a])
[[0, 0], [1, 0, 0], [1, 0]]