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

Using Numpy you can easily solve this issue in one line:

1: Input

input_val = [[1, 2, 3, 4, 5],
             [1, 2, 3, 4, 5],
             [1, 2, 3, 4, 5]]

2: Numpy does the math for you

np.sum(input_val,axis=0)

3: Then finally the results

array([ 3,  6,  9, 12, 15])