Can somebody help me to understand this code. How are we able to get the sum in this one?

Question

import numpy as np

two_d = np.array([[1,2,3,4], [5,6,7,8]]) # 2 x 4
one_d = np.array([[10]]) # 1
three_d = np.ones((3, 2)) # 3 x 2

print(np.add(two_d,one_d)) # I didn't get this addition part

print(np.add(one_d, three_d)) #here also

Answer 1

It's adding the arrays together. Unlike lists, arrays (or matrices) are added algebraically element-wise. So in the first case, an element 10 is added to all elements of the two_d array and in the second case, 10 is added to all elements of three_d array (which is a matrix of ones).

np.sum method will give you the sum of elements, if that's what you are looking for.

Answer 2

I have played around a bit with it. Read the comments in the code.

https://code.sololearn.com/cFk244NX598J/?ref=app

Answer 3

thank you for the help. I got it. Kuba Siekierzyński and cyk .