How do I multiply matrices having elements as vectors?

A*B doesn't work A.*B doesn't work either since it multiplies them element by element

[Adam]

Can't you give an example together with your expected result. I don't really understand what you are asking. Just saying things "don't work" is not a very useful piece of information. Do you mean you get a syntax error or the wrong answer?

[Sameer]

         a=1:1000;
    A=[a 2*a;a 2*a];
    B=[2*a a;a a];
    C=A*B  %Error using  * 
%Inner matrix dimensions must agree.
 D= A.*B % multiplies element by element which I don't want

[Adam]

So what is your expected result?

Answer 1

[Matthew Eicholtz]

If I understand the question correctly, you are asking how to multiply two vectors of the same size.

Without loss of generality, let's assume A and B are 1x10 vectors. A*B will not work because the inner dimensions do not match (1x10 * 1x10). A.*B will only multiply each pair of elements as you noticed, yielding a 1x10 result.

Two potential solutions:

1. dot(A,B)
2. A*B'