how to correct this index error ?

Question

Dhines 2013-1-9

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su=4;
sv=4;
fh=[1 2 3 4; 2 3 4 5 ; 5 6 7 8 ; 1 2 3 5];
for i=-4:4
    for j=-4:4   
        a(i,j)=1;
        for u=1:su-2
            for v=1:sv
                 if (fh(u,v)==i && fh(u+1,v)==j)
                     dell=1;
                 else
                     dell=0;
                 end 
                 a(i,j)=a(i,j)+dell;
            end
        end
    end
end

..when i run this code i got this error..

??? Attempted to access a(-4,-4); index must be a positive integer or logical.
Error in ==> testit at 6
      a(i,j)=1;

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Andrei Bobrov 2013-1-9

see this answer

Jan 2013-1-9

Please, prasana, use meaningful tags. Almost all questions in this forum concern Matlab code.

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Answer 1

Jan 2013-1-9

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https://ww2.mathworks.cn/matlabcentral/answers/58301-how-to-correct-this-index-error#answer_70539

在 MATLAB Online 中打开

You are working with Matlab for at least 3 month. It is time to read the Getting Started chapters to find out, that indices must be positive integers. Therefore you cannot access the element a(-4, -4). This seems to be a trivial solution: