multiplying matrices code example
Example 1: how to multiply matrices in python
X = [[12,7,3],
[4 ,5,6],
[7 ,8,9]]
Y = [[5,8,1,2],
[6,7,3,0],
[4,5,9,1]]
result = [[sum(a*b for a,b in zip(X_row,Y_col)) for Y_col in zip(*Y)] for X_row in X]
Example 2: how to multiply matrices in python
>>> a = np.ones([9, 5, 7, 4])
>>> c = np.ones([9, 5, 4, 3])
>>> np.dot(a, c).shape
(9, 5, 7, 9, 5, 3)
>>> np.matmul(a, c).shape
(9, 5, 7, 3)
>>>
Example 3: how to multiply two matrices
When we do multiplication of matrices
The number of columns of the 1st matrix must equal the number
of rows of the 2nd matrix.
And the result will have the same number of rows as the 1st matrix,
and the same number of columns as the 2nd matrix.