Created
February 26, 2020 19:19
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algoritmo multiplicador de matrizes que mostra a expansão dos somatórios necessários para o cálculo das multiplicações
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import numpy as np | |
def multiplicar_matrizes(A, B): | |
def somatorio(i, j): | |
expressao = 'r['+ str(int(i + 1)) + ', ' + str(int(j + 1)) + ']=\t' | |
r = 0 | |
for k in range(len(A[i])): | |
expressao += '(' + str(int(A[i][k])) + '*' + str(int(B[k][j])) + ')' | |
if k < len(A[i]) - 1: | |
expressao += ' +\t' | |
r += A[i][k] * B[k][j] | |
return r, expressao | |
# se o numero de colunas da matriz A | |
# for diferente do numero de linhas | |
# da matriz B, a multiplicacao nao | |
# pode ser realizada | |
if len(A[0]) != len(B): | |
raise Exception('As dimensões das matrizes são incompatíveis') | |
resultado = '\t\tai1b1j\tai2b2j\tai3b3j\tai4b4j\tai5b5j\n' | |
R = np.array([[0 for i in range(len(B[-1]))] for j in range(len(A))]) | |
for l in range(len(A)): | |
for c in range(len(B[-1])): | |
r, expressao = somatorio(l, c) | |
R[l][c] = r | |
resultado += expressao + ' = ' + str(int(r)) + '\n' | |
return R, resultado | |
A = np.array([[0, 1, 1, 1, 1],[1, 0, 1, 1, 0],[0, 1, 0, 1, 0],[0, 0, 1, 0, 1],[0, 0, 0, 1, 0]]) | |
A2, expansao = multiplicar_matrizes(A, A) | |
print('AxA\n' + str(A2) + '\n') | |
print('\t\tSomatórios Realizados\n\n' + expansao) |
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