[FIXED] How to calculate the avearge of every 4 elements in numpy array

Issue

sample_list = np.array([1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16])

Required to take the average of every 4 
like 1,2,3,4 average is 2.5
followed by 5,6,7,8 is 6.5
followed by 9,10,11,12 is 10.5
followed by 13,14,15,16 is 14,5

expexted output:

[2.5, 6.5, 10.5, 14.5]

so far i tried with refering this questions Average of each consecutive segment in a list

Calculate the sum of every 5 elements in a python array

Solution

Use reshape. In following example reshape(-1, 4) means 4 elements per row

import numpy as np

sample_list = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16])

print(np.mean(sample_list.reshape(-1, 4), axis=1))

output

[2.5, 6.5, 10.5, 14.5]

Answered By - Faisal Nazik