Kronecker product." Perhaps this is what you are looking for.
I am developing an application for adaptive filtering where I have two matrices A and B.
Matrix A is of order (21 * 1)
Matrix B is of order (23 * 23)
By the rule of matrix multiplication we cannot multiply such a pair of matrices.
Is there any theory which tells how to multiply these.
I found a method for adding such a pair of matrices and hence it occurs to me that there has to be a solution for proposed problem.