Title: Create A Sparse Matrix
Slug: create_a_sparse_matrix
Summary: How to create a sparse matrix in Python.
Date: 2017-09-03 12:00
Category: Machine Learning
Tags: Vectors Matrices Arrays
Authors: Chris Albon

Preliminaries



In [1]:

    
# Load libraries
import numpy as np
from scipy import sparse

Create Dense Matrix



In [2]:

    
# Create a matrix
matrix = np.array([[0, 0],
                   [0, 1],
                   [3, 0]])

Convert To Sparse Matrix



In [ ]:

    
# Create compressed sparse row (CSR) matrix
matrix_sparse = sparse.csr_matrix(matrix)

Note: There are many types of sparse matrices. In the example above we use CSR but the type we use should reflect our use case.