NUMPY AND OTHER OPERATIONS

NumPy provides the “*” operator to multiply the components of two vectors to produce a third vector whose components are the products of the corresponding components of the initial pair of vectors. This operation is called a Hadamard product, which is the name of a famous mathematician. If you then add the components of the third vector, the sum is equal to the inner product of the initial pair of vectors.

Listing 2.16 displays the content of otherops.py that illustrates how to perform other operations on a NumPy array.

LISTING 2.16: otherops.py

import numpy as np

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

print('a:           ',a)
print('b:           ',b)
print('a*b:         ',a*b)
print('np.sum(a*b): ',np.sum(a*b))
print('(a*b.sum()): ',(a*b).sum())

Listing 2.16 contains two NumPy arrays called a and b followed five print() statements that display the contents of a and b, their Hadamard product...