Title: Calculate The Average, Variance, And Standard Deviation
Slug: calculate_average_variance_and_standard_deviation
Summary: How to calculate the average, variance, and standard deviation of an array in Python.
Date: 2017-09-04 12:00
Category: Machine Learning
Tags: Vectors Matrices Arrays
Authors: Chris Albon

Preliminaries



In [1]:

    
# Load library
import numpy as np

Create Matrix



In [2]:

    
# Create matrix
matrix = np.array([[1, 2, 3],
                   [4, 5, 6],
                   [7, 8, 9]])

Calculate Mean



In [3]:

    
# Return mean
np.mean(matrix)









    Out[3]:





5.0

Calculate Variance



In [4]:

    
# Return variance
np.var(matrix)









    Out[4]:





6.666666666666667

Calculate Standard Deviation



In [5]:

    
# Return standard deviation
np.std(matrix)









    Out[5]:





2.5819888974716112