matrix multiplication in python
# input two matrices of size n x m
matrix1 = [[12,7,3],
[4 ,5,6],
[7 ,8,9]]
matrix2 = [[5,8,1],
[6,7,3],
[4,5,9]]
res = [[0 for x in range(3)] for y in range(3)]
# explicit for loops
for i in range(len(matrix1)):
for j in range(len(matrix2[0])):
for k in range(len(matrix2)):
# resulted matrix
res[i][j] += matrix1[i][k] * matrix2[k][j]
print (res)matrix multiplication python
# Program to multiply two matrices using nested loops
# 3x3 matrix
X = [[12,7,3],
[4 ,5,6],
[7 ,8,9]]
# 3x4 matrix
Y = [[5,8,1,2],
[6,7,3,0],
[4,5,9,1]]
# result is 3x4
result = [[0,0,0,0],
[0,0,0,0],
[0,0,0,0]]
# iterate through rows of X
for i in range(len(X)):
# iterate through columns of Y
for j in range(len(Y[0])):
# iterate through rows of Y
for k in range(len(Y)):
result[i][j] += X[i][k] * Y[k][j]
for r in result:
print(r)python matrix multiplication
>>> a = np.array([[ 5, 1 ,3],
[ 1, 1 ,1],
[ 1, 2 ,1]])
>>> b = np.array([1, 2, 3])
>>> print a.dot(b)
array([16, 6, 8])Copyright © 2021 Codeinu
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