using nested for loops

Hi, how to use nested for loops to multiply 2 matrices and make it work just like MATLAB operator? The function must work on matrices of any compatible size. I know what is nested for loops but in this case ,I dunno hw to apply it. Any help is much appreciated.Thanks.

Answer 1

[Andrei Bobrov]

most unwise variant

function C = yourmtimes(A,B)
[m,namb] = size(A);
n = size(B,2);
C = zeros(m,n);
for ii = 1:m
    for jj = 1:n
        c1 = 0;
        for k = 1:namb
            c1 = c1 + A(ii,k)*B(k,jj);
        end
        C(ii,jj) = c1;
    end
end

more

m = size(A,1);
n = size(B,2);
C = zeros(m,n);
for ii = 1:m
    for jj = 1:n
         C(ii,jj) = sum(A(ii,:).*B(:,jj).');
    end
end

or

m = size(A,1);
n = size(B,2);
C = zeros(m,n);
for ii = 1:m
    for jj = 1:n
         C(ii,jj) = A(ii,:)*B(:,jj);
    end
end

or

m = size(A,1);
n = size(B,2);
C = zeros(m,n);
nones = ones(n,1);
for ii = 1:m
    C(ii,:) = sum(A(ii*nones,:).'.*B);
end

etc.

[Leon Barainsky]

None of them work for me, could there be something wrong with my matlab settings?