# Compute two matices without using the matrix multiplication

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Mansour Al Asais on 25 Apr 2020
Hello, the title is the question and here is my code so far but I don't think it's right:
a=input('Enter a: ');
b=input('Enter b: ');
C=[];
for i=1:length(a)
for d=1:length(b)
C(i,d)=a(i).*b(d);
end
end

Sriram Tadavarty on 25 Apr 2020
Hi Mansour,
Here is the modifications that is required for the code: (Placed a static a and b values, replace with those in your code)
a = [1 2 3; 4 5 6];
b = [1 2 3 5;6 7 8 9;10 11 12 13];
if size(a,2) ~= size(b,1)
error("Matrix multiplication is not possible.");
end
c = zeros(size(a,1),size(b,2));
for i = 1:size(a,1)
for j = 1:size(b,2)
c(i,j) = a(i,:)*b(:,j);
end
end
Hope this helps.
Regards,
Sriram

Mrutyunjaya Hiremath on 25 Apr 2020
error("Matrix multiplication is not possible.");
Should be like this, if I am not wrong
error('Matrix multiplication is not possible.');
Sriram Tadavarty on 25 Apr 2020
Hi,
Either way is possible. It depends on the MATLAB version you are using. From R2017a or above, strings are supported.
You can always go with character array too.
Hope this helps.
Regards,
Sriram
Mrutyunjaya Hiremath on 25 Apr 2020
Ok got it. :)