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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.



# 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.

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