pythonmatrixmatrix-multiplicationscalar

matrix multiplication with a constant

How can I multiply the following 1x1x3 matrix with a constant value (scalar):

a = [[[1, 2, 3]]]

For example, multiplying a by 3 should produce the following:

a*3 = [[[3,6,9]]]
Solution

  • Use NumPy:

    In [1]: import numpy as np

In [2]: a = np.array([[[1, 2, 3]]])

In [3]: a
Out[3]: array([[[1, 2, 3]]])

In [4]: a*3
Out[4]: array([[[3, 6, 9]]])