Sunday 3 March 2019

Multiply two Matrix in 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)


Output:
[114, 160, 60, 27]
[74, 97, 73, 14]
[119, 157, 112, 23]

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