Create random numpy matrix of same size as another.

Question

This question here was useful, but mine is slightly different.

I am trying to do something simple here, I have a numpy matrix A, and I simply want to create another numpy matrix B, of the same shape as A, but I want B to be created from numpy.random.randn() How can this be done? Thanks.

Answer 1

np.random.randn takes the shape of the array as its input which you can get directly from the shape property of the first array. You have to unpack a.shape with the * operator in order to get the proper input for np.random.randn.

a = np.zeros([2, 3])
print(a.shape)
# outputs: (2, 3)
b = np.random.randn(*a.shape)
print(b.shape)
# outputs: (2, 3)