Error in Matrix multiplication function.
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The message below is the error I get when I run this function file. I am not sure why. The function is supposed give an error if the matrix is not the same size. Any help is appreciated.
Subscript indices must either be real positive integers or logicals.
Error in matrix_multip (line 12)
C(i,j)=A(i,j)*B(i,j);
function [C]=matrix_multip(A,B)
[m,n]=size(A);
[p,q]=size(B);
i=1;
if m~=q || n~=p
disp('Error! Matrices are not same size.')
else
while i<=m
while j<=n
C(i,j)=A(i,j)*B(i,j);
end
end
end
回答（1 个）
You need to initialize j to 1 (else MATLAB thinks it's sqrt(-1) ) just as you've done for i.
You also need to increment the counters i and j in appropriate places.
3 个评论
Walter Roberson
2015-7-16
It would make more sense to use "for" instead of "while"
David Hughes
2015-7-16
Muthu Annamalai
2015-7-16
Matrix multiplication algorithm in full scalar case needs 3-nested loops.
So in your case you are actually trying to find a dot product, i.e. a sum of products.
So I would rewrite the line
C(i,j)=(A(i,:)*B(:,j));
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2015-7-16
2015-7-16
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