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

Question

Abdalla Khan 2019-6-16

0
链接

此问题的直接链接

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

评论： madhan ravi 2019-6-17

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 ([])

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

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...

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Manvi Goel 2019-6-17

2
链接

此回答的直接链接

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