How to implement matrix multiplication by python

In this paper, we describe how to implement matrix multiplication in Python. Share to everyone for your reference. The implementation method is as follows:

def Matrixmul (A, B): res = [[0] * len (b[0]) for I in Range (Len (a))] for I in range (Len (a)): fo R j in Range (Len (b[0)): For K in range (len (B)): res[i][j] + = a[i][k] * B[k][j] return resdef matrixMul2 (A, b  ): return [[[Sum] (A * b for a, b in zip (A, b)) ' for B ' in Zip (*b)] ' for a ' in a]a = [[+], [3,4], [5,6], [7,8]]b = [[1,2,3,4], [5,6,7,8]] Print Matrixmul (A, b) print Matrixmul (b,a) print "-" *90print MatrixMul2 (A, b) print matrixMul2 (b,a) print "-" *90from numpy Import Dotprint Map (List,dot (b)) print map (List,dot (b,a)) #Out: #[[11, 14, 17, 20], [23, 30, 37, 44], [35, 46, 57, 68], [47 , 92]]#[[50, the 140]]#------------------------------------------------------------------------#[[11, and (+), [+], [+], [Max], [Max], [+], [+], [] ----------------------------------------#[[11, 14, 17, 20], [23, 30, 37, 44], [35, 46, 57, 68], [47, 62, 77, 92]]#[[50, 60 ], [[a]] 

Hopefully this article will help you with Python programming.

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