本文實例講述了python實現(xiàn)矩陣乘法的方法。分享給大家供大家參考。具體實現(xiàn)方法如下：
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]]
希望本文所述對大家的Python程序設(shè)計有所幫助。
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