To multiply the elements of an array by a number in python, a solution is to use the * operator, example:

`>>> import numpy as np`

`>>> A = np.array([[1,2,0],[4,3,-1]])`

`>>> A`

`array([[ 1, 2, 0],`

`[ 4, 3, -1]])`

`>>> A * 2`

`array([[ 2, 4, 0],`

`[ 8, 6, -2]])`

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