NumPy ufuncs - Products

To find the product of the elements in an array, use theprod() function

Products

To find the product of the elements in an array, use the prod() function.

Find the product of the elements of this array:

import numpy as np

arr = np.array([1, 2, 3, 4])

x = np.prod(arr)

print(x)

Returns: 24 because 1*2*3*4 = 24

Find the product of the elements of two arrays:

import numpy as np

arr1 = np.array([1, 2, 3, 4])
arr2 = np.array([5, 6, 7, 8])

x = np.prod([arr1, arr2])

print(x)

Returns: 40320 because 1*2*3*4*5*6*7*8 = 40320

If you specify axis=1, NumPy will return the product of each array.

Perform summation in the following array over 1st axis:

import numpy as np

arr1 = np.array([1, 2, 3, 4])
arr2 = np.array([5, 6, 7, 8])

newarr = np.prod([arr1, arr2], axis=1)

print(newarr)

Returns: [24 1680]

Cummulative product means taking the product partially.

E.g. The partial product of [1, 2, 3, 4] is [1, 1*2, 1*2*3, 1*2*3*4] = [1, 2, 6, 24]

Perfom partial sum with the cumprod() function.

Take cummulative product of all elements for following array:

import numpy as np

arr = np.array([5, 6, 7, 8])

newarr = np.cumprod(arr)

print(newarr)

Returns: [5 30 210 1680]

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