numpy: multiply arrays rowwise

For those who don't want to use np.newaxis or reshape, this is as simple as:

a * b[:, None]

This is because np.newaxis is actually an alias for None.

Read more here.

add an axis to b:

>>> np.multiply(a, b[:, np.newaxis])
array([[ 1,  2],
       [ 6,  8],
       [15, 18],
       [28, 32]])

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