Matrix product using for/while loop

I got this task and I should find the error in this function hat should give us the product of 2 martices .

function [M_erg] = matrix_mult(M1,M2)
M_erg = zeros(size(M1,1),size(M2,2));
for i = 1:1:size(M1,1)
    for j = 1:1:size(M2,2)
        k=1;
        while (k<=size(M1,1))
            M_erg(i,j) = M_erg(i,k) + M1(i,k) * M2(k,j);
            k=k+1;
        end
    end
end
end

Answer 1

[James Tursa]

The inner most loop needs to iterate over the 2nd index of M1, not the first index. E.g.,

while (k<=size(M1,2))  %<-- 2nd index
    M_erg(i,j) = M_erg(i,j) + M1(i,k) * M2(k,j);  %<-- also fixed typo for M_erg(i,j)

Note that the inner most loop could be written as a for-loop also.

[Sedki Ben Salem]

Thank you so much