numpy 矩阵运算 | repmat()函数

numpy.matlib.repmat()是另一个在 numpy 中进行矩阵运算的函数。它返回重复 0-D、1-D 或 2-D 数组或矩阵 M x N 次。

Syntax : numpy.matlib.repmat(a, m, n)

Parameters :
a : [array_like] The input array or matrix which to be repeated.
m, n : [int] The number of times a is repeated along the first and second axes.

Return : [ndarray] repeating array.

代码#1：

# Python program explaining
# numpy.matlib.repmat() function
  
# importing numpy and matrix library
import numpy as geek
import numpy.matlib
  
# creating input array using  
# array function 
in_arr = geek.array([[1, 0, 2], [3, 4, 5]])
print("Input array", in_arr) 
  
# making a new array 
# using repmat() function 
out_mat = geek.matlib.repmat(in_arr, 2, 3) 
print ("Output repeated matrix : ", out_mat) 

输出 ：

Input array [[1 0 2]
 [3 4 5]]
Output repeated matrix :  [[1 0 2 1 0 2 1 0 2]
 [3 4 5 3 4 5 3 4 5]
 [1 0 2 1 0 2 1 0 2]
 [3 4 5 3 4 5 3 4 5]]

代码#2：

# Python program explaining
# numpy.matlib.repmat() function
  
# importing numpy and matrix library
import numpy as geek
import numpy.matlib
  
# creating input array using  
# arange function 
in_arr = geek.arange(3)
print("Input array", in_arr) 
  
# making a new array 
# using repmat() function 
out_mat = geek.matlib.repmat(in_arr, 2, 2) 
print ("Output repeated matrix : ", out_mat) 

输出 ：

Input array [0 1 2]
Output repeated matrix :  [[0 1 2 0 1 2]
 [0 1 2 0 1 2]]