Interleave rows of two numpy arrays in Python

Question

I wanted to interleave the rows of two numpy arrays of the same size. I came up with this solution.

# A and B are same-shaped arrays
A = numpy.ones((4,3))
B         


        

Answer 1

It is maybe a bit clearer to do:

A = np.ones((4,3))
B = np.zeros_like(A)

C = np.empty((A.shape[0]+B.shape[0],A.shape[1]))

C[::2,:] = A
C[1::2,:] = B

and it's probably a bit faster as well, I'm guessing.