How to sum columns of an array in Python

Question

How do I add up all of the values of a column in a python array? Ideally I want to do this without importing any additional libraries.

input_val = [[1, 2, 3,         


        

Answer 1

Please construct your array using the NumPy library:

import numpy as np

create the array using the array( ) function and save it in a variable:

 arr = np.array(([1, 2, 3, 4, 5],[1, 2, 3, 4, 5],[1, 2, 3, 4, 5]))

apply sum( ) function to the array specifying it for the columns by setting the axis parameter to zero:

arr.sum(axis = 0)