Compute two matices without using the matrix multiplication

Question

Mansour Al Asais 2020-4-25

0
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https://ww2.mathworks.cn/matlabcentral/answers/520749-compute-two-matices-without-using-the-matrix-multiplication

评论： Mrutyunjaya Hiremath 2020-4-25

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

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Answer 1

Sriram Tadavarty 2020-4-25

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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