This article mainly introduces how to implement matrix multiplication in python. The example analyzes the skills related to Python matrix operations. For more information about how to implement matrix multiplication in python, see the following example. Share it with you for your reference. The specific 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)): for 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 = [[1,2], [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(a,b))print map(list,dot(b,a))#Out:#[[11, 14, 17, 20], [23, 30, 37, 44], [35, 46, 57, 68], [47, 62, 77, 92]]#[[50, 60], [114, 140]]#------------------------------------------------------------------------#[[11, 14, 17, 20], [23, 30, 37, 44], [35, 46, 57, 68], [47, 62, 77, 92]]#[[50, 60], [114, 140]]#------------------------------------------------------------------------#[[11, 14, 17, 20], [23, 30, 37, 44], [35, 46, 57, 68], [47, 62, 77, 92]]#[[50, 60], [114, 140]]
I hope this article will help you with Python programming.