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numpy.eye() in Python

  • Last Updated : 04 Aug, 2021

numpy.eye(R, C = None, k = 0, dtype = type <‘float’>) : –The eye tool returns a 2-D array with  1’s as the diagonal and  0’s elsewhere. The diagonal can be main, upper, or lower depending on the optional parameter k. A positive k is for the upper diagonal, a negative k is for the lower, and a  0 k (default) is for the main diagonal.

Parameters : 

R : Number of rows
C : [optional] Number of columns; By default M = N
k : [int, optional, 0 by default]
          Diagonal we require; k>0 means diagonal above main diagonal or vice versa.
dtype : [optional, float(by Default)] Data type of returned array.  

Returns : 

array of shape, R x C, an array where all elements 
are equal to zero, except for the k-th diagonal, 
whose values are equal to one.

Example:

Python




# Python Programming illustrating
# numpy.eye method
 
import numpy as geek
 
# 2x2 matrix with 1's on main diagonal
b = geek.eye(2, dtype = float)
print("Matrix b : \n", b)
 
# matrix with R=4 C=5 and 1 on diagonal
# below main diagonal
a = geek.eye(4, 5, k = -1)
print("\nMatrix a : \n", a)

Output : 

Matrix b : 
 [[ 1.  0.]
 [ 0.  1.]]

Matrix a : 
 [[ 0.  0.  0.  0.  0.]
 [ 1.  0.  0.  0.  0.]
 [ 0.  1.  0.  0.  0.]
 [ 0.  0.  1.  0.  0.]]

Note : 
These codes won’t run on online-ID. Please run them on your systems to explore the working.

This article is contributed by Mohit Gupta_OMG 😀. If you like GeeksforGeeks and would like to contribute, you can also write an article using write.geeksforgeeks.org or mail your article to review-team@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
 

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