numpy 矩阵运算 |身份()函数
numpy.matlib.identity()
是另一个在 numpy 中进行矩阵运算的函数。它返回给定输入大小的平方单位矩阵。
Syntax : numpy.matlib.identity(n, dtype=None)
Parameters :
n : [int] Number of rows and columns in the output matrix.
dtype : [optional] Desired output data-type.
Return : n x n matrix with its main diagonal set to one, and all other elements zero.
代码#1:
# Python program explaining
# numpy.matlib.identity() function
# importing matrix library from numpy
import numpy as geek
import numpy.matlib
# desired 3 x 3 output square identity matrix
out_mat = geek.matlib.identity(3)
print ("Output matrix : ", out_mat)
输出 :
Output matrix :
[[ 1. 0. 0.]
[ 0. 1. 0.]
[ 0. 0. 1.]]
代码#2:
# Python program explaining
# numpy.matlib.identity() function
# importing numpy and matrix library
import numpy as geek
import numpy.matlib
# desired 5 x 5 output square identity matrix
out_mat = geek.matlib.identity(n = 5, dtype = int)
print ("Output matrix : ", out_mat)
输出 :
Output matrix :
[[1 0 0 0 0]
[0 1 0 0 0]
[0 0 1 0 0]
[0 0 0 1 0]
[0 0 0 0 1]]