numpy matrix operations | ones() function

Last Updated : 21 Feb, 2019

numpy.matlib.ones() is another function for doing matrix operations in numpy. It returns a matrix of given shape and type, filled with ones.

Syntax : numpy.matlib.ones(shape, dtype=None, order='C') Parameters : shape : [int, int] Number of rows and columns in the output matrix.If shape has length one i.e. (N, ), or is a scalar N, out becomes a single row matrix of shape (1, N). dtype : [optional] Desired output data-type. order : Whether to store multi-dimensional data in row-major (C-style) or column-major (Fortran-style) order in memory. Return : Matrix of ones of given shape, dtype, and order.

Code #1 :

Python3

# Python program explaining # numpy.matlib.ones() function # importing matrix library from numpy import numpy as geek import numpy.matlib # desired 3 x 4 output matrix  out_mat = geek.matlib.ones((3, 4)) print ("Output matrix : ", out_mat)

Output :

 Output matrix : Output matrix : [[ 1. 1. 1. 1.] [ 1. 1. 1. 1.] [ 1. 1. 1. 1.]]

Code #2 :

Python3

# Python program explaining # numpy.matlib.ones() function # importing numpy and matrix library import numpy as geek import numpy.matlib # desired 1 x 5 output matrix  out_mat = geek.matlib.ones(shape = 5, dtype = int) print ("Output matrix : ", out_mat)