Compute two matices without using the matrix multiplication

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

Answer 1

[Sriram Tadavarty]

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]

@ Sriram Tadavarty

error("Matrix multiplication is not possible.");

Should be like this, if I am not wrong

error('Matrix multiplication is not possible.');

[Sriram Tadavarty]

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]

Ok got it. :)