Python程序使用多维数组相乘两个矩阵

              	      [b1, b2]			[a1, a2, a3]    *     [b3, b4]		= 	[a1*b1+a2*b2+a3*a3][a4, a5, a6]          [b5, b6]			[a4*b2+a5*b4+a6*b6]

[a11, a12, a13]	      [b11, b12, b13]		[a11*b11, a12*b12, a13*b13][a21, a22, a23]   *   [b21, b22, b23]	    =	[a21*b21, a22*b22, a23*b23][a31, a32, a33]	      [b31, b32, b33]		[a31*b31, a32*b32, a33*b33]

# Defining the matrix using multidimensional arraysmatrix_a = [[1,2,3],            [4,1,2],            [2,3,1]] matrix_b = [[1,2,3,2],            [2,3,6,3],            [3,1,4,2]]#function for displaying matrixdef display(matrix):   for row in matrix:      print(row)   print()# Display two input matricesprint('The first matrix is defined as:') display(matrix_a)print('The second matrix is defined as:')display(matrix_b)# Initializing Matrix with all 0sresult = [[0, 0, 0, 0],[0, 0, 0, 0],[0, 0, 0, 0]]# multiply two matrices for i in range(len(matrix_a)):   # iterate through rows    for j in range(len(matrix_b[0])):      # iterate through columns      for k in range(len(matrix_b)):                 result[i][j] = matrix_a[i][k] * matrix_b[k][j]print('The multiplication of two matrices is:')display(result)

The first matrix is defined as:[1, 2, 3][4, 1, 2][2, 3, 1]The second matrix is defined as:[1, 2, 3, 2][2, 3, 6, 3][3, 1, 4, 2]The multiplication of two matrices is:[9, 3, 12, 6][6, 2, 8, 4][3, 1, 4, 2]

import numpy as np# Defining the matrix using numpy arraymatrix_a = np.array([[1,2,5], [1,0,6], [9,8,0]])matrix_b = np.array([[0,3,5], [4,6,9], [1,8,0]])# Display two input matricesprint('The first matrix is defined as:') print(matrix_a)print('The second matrix is defined as:')print(matrix_b)# multiply two matricesresult = matrix_a @ matrix_bprint('The multiplication of two matrices is:')print(result) 

The first matrix is defined as:[[1 2 5] [1 0 6] [9 8 0]]The second matrix is defined as:[[0 3 5] [4 6 9] [1 8 0]]The multiplication of two matrices is:[[ 13  55  23] [  6  51   5] [ 32  75 117]]

import numpy as np# Defining the matrix using numpy arraymatrix_a = np.array([[1,2,5], [1,0,6], [9,8,0]])matrix_b = np.array([[0,3,5], [4,6,9], [1,8,0]])# Display two input matricesprint('The first matrix is defined as:') print(matrix_a)print('The second matrix is defined as:')print(matrix_b)# multiply elements of two matricesresult = matrix_a * matrix_bprint('The element-wise multiplication of two matrices is:')print(result)

The first matrix is defined as:[[1 2 5] [1 0 6] [9 8 0]]The second matrix is defined as:[[0 3 5] [4 6 9] [1 8 0]]The element-wise multiplication of two matrices is:[[ 0  6 25] [ 4  0 54] [ 9 64  0]]