When Does Matrix Multiplication Not Work?

[j-lee00]

simple matrix question


For Matrix A; size (3 x 1)
Matrix B; size (1 x 3)

AB = (3 x 3)

But when does matrix multiplication not work?

 

[The|M|onster]

Matrix multiplication does not work when the number of columns in the first matrix is not equal to the number of rows in the second matrix.

 

[j-lee00]

Cheers