matrix multiplication
Gregory Ewing
greg.ewing at canterbury.ac.nz
Mon Feb 26 18:25:30 EST 2018
Seb wrote:
> I was wondering is whether there's a faster way of
> multiplying each row (1x3) of a matrix by another matrix (3x3), compared
> to looping through the matrix row by row as shown in the code.
Just multiply the two matrices together.
If A is an nx3 matrix and B is a 3x3 matrix, then
C = A @ B is an nx3 matrix where C[i] = A[i] @ B.
(This is a property of matrix multiplication in
general, nothing special about numpy.)
--
Greg
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