Multiplying 2 Matrices A and B from Scratch (not built in function

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Abdalla Khan 2019-6-16

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评论： Walter Roberson 2024-10-8

How can i write a matlab function which accepts two Matrices A and B and from scratch(indexing - not built in functions) multiplies them together. in the case that they can not be multiplied together simply return an empty matrix ([])

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dpb 2019-6-16

Obviously homework...show your work to date and where, specifically, you got stuck on a Matlab-related question.

Of course, you start with the definition of what matrix multiplication is...

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回答（1 个）

Manvi Goel 2019-6-17

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https://ww2.mathworks.cn/matlabcentral/answers/467367-multiplying-2-matrices-a-and-b-from-scratch-not-built-in-function#answer_379467

在 MATLAB Online 中打开

Here you go

function result =  mult(a, b)
    [r1, c1] = size(a);
    [r2, c2] = size(b); 
    if( c1 == r2)
        result = zeros(r1, c2);
        for i  = 1: r1
           for j =1:c2
              for k = 1:r2
                  result(i,j) = result(i,j) + a(i,k) * b(k,j);
              end
           end
        end
    else
        result = [];
    end
    disp(result)
end