如何在Python中将两个矩阵相乘 [英] How to multiply two matrices together in Python

问题描述

Python的新手，正在尝试仅使用Python将多个矩阵相乘.为了简单起见，我们将说它们的大小将始终相同.我尝试了很多不同的方法，但是还没有弄清楚.这是两个矩阵:

Brand new to Python and am trying to multiply to matrices together using only Python. To keep it simple, we'll say that they will always be the same size. I have tried so many different ways, but haven't figured it out. Here are the two matrices:

matrix_a = [[1、2、3]，[1、2、3]，[1、2、3] matrix_b = [[3，2，1]，[3，2，1]，[3，2，1]]

matrix_a = [[1, 2, 3], [1, 2, 3], [1, 2, 3]] matrix_b = [[3, 2, 1], [3, 2, 1], [3, 2, 1]]

预先感谢

推荐答案

对于此任务，我建议使用 numpy ，但是这里有一些建议应该工作:

I would recommend numpy for this task however here is something that should work:

def multi(x,y):
    d = []
    i = 0
    while i < len(x):
        j = 0
        e = []
        while j < len(y[0]):
            k = 0
            r = 0
            while k < len(x[0]):
                r += x[i][k] * y[k][j]
                k += 1
            j += 1
            e.append(r)
        d.append(e)
        i += 1
    print(d)

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