How to calculate multiplying two matrices using (for) and (if) loops together ???

How to calculate multiplying two matrices provided that the number of line elements in the first matrix equals the number of column elements in the second matrix (using the loop (for) and (if) together) thank you

[James Tursa]

What have you done so far? What specific problems are you having with your code?

[Image Analyst]

I think you got the requirement wrong: "the number of line elements in the first matrix equals the number of column elements in the second matrix"

It should be, with r1xc1 * r2xc2, then c1 must equal r2 - the number of columns of the first matrix must equal the number of rows in the second matrix, not what you said. You'll see MATLAB using jargon like "the inner dimensions must match" meaning c1 = r2.

Anyway, see hints below in the Answers section.

[Walter Roberson]

please do not close questions that have an answer

Answer 1

[Image Analyst]

Hint:

if ~isequal(R, G)
        uiwait(errordlg('The matrices are not the same size'));
        return;
end

Answer 2

[Omer Yasin Birey]

Hi hcourah, you can add try - catch to send the message

for i=1:n
    for j=1:m
        try 
            c(i,j)=A(i,:)*b(:,j);
        catch 
            warning('The matrices are not the same dimension.')        
        end
    end
end