求助python两个矩阵元素相乘

可乐不冰怎么喝

import numpy as np #导入numpy库：用于矩阵运算
import numpy.matlib
m = 2
n = 3
d = np.array([[12, 23, 0], [5, 8, 4]])
b = np.mat([5])
theta = np.matlib.repmat(b,1,n)
a = np.matlib.repmat(theta,m,1)

print(d * a)

想问一下大佬们，为啥会出现这个错误：ValueError: shapes (2,3) and (2,3) not aligned: 3 (dim 1) != 2 (dim 0)

傻眼貓咪

矩阵相乘
（m*n 矩阵）*（n*p 矩阵）
n 必须相同

傻眼貓咪

import numpy as np

A = np.array([[1, 2, 3], [4, 5, 6]])
B = np.array([[1, 2], [3, 4], [5, 6]])
C = np.dot(A, B)

print(C)

[[22 28]
 [49 64]]

傻眼貓咪

import numpy as np

A = np.mat([[1, 2, 3], [4, 5, 6]])
B = np.mat([[7, 8], [9, 10], [11, 12]])

print(A * B)

[[ 58  64]
 [139 154]]

傻眼貓咪

你的代码：

import numpy as np
import numpy.matlib

m = 2
n = 3

d = np.array([[12, 23, 0], [5, 8, 4]])
b = np.mat([5])

theta = np.matlib.repmat(b, 1, m) # <------ 注意这里
a = np.matlib.repmat(theta, n, 1) # <------ 注意这里

print(d * a)

[[175 175]
 [ 85  85]]