Index exceeds matrix dimensions, error problem

Question

Grace 2014-6-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/132825-index-exceeds-matrix-dimensions-error-problem

回答： chaima kadess 2018-4-8

 function cut=UDcutcut(n,s,p)
 initial=[ 1 3;2 6; 3 2; 4 5; 5 1; 6 4; 7 7];
[r s]=size(initial);
new_initial=cell(s,1);
UT=cell(s,r);
for col=1:s
    temp=sortrows(initial,col);
    new_inital{col}=temp;
    for m=1:p
        if m>n
            UT{col,m}=new_initial{col}(m-n:m-1,:);
        else
            j=1:m-1;
            a=new_initial{col}(j,:);
            i=m:n;
            b=new_initial{col}(i+p-n,:);
            UT{col,m}=cat(1,a,b);
        end
    end
end
cut=UT;
end

When I run the code, the programme shows me:

 >> UDcutcut(4,2,7)
Index exceeds matrix dimensions.
 Error in UDcutcut (line 17)
            b=new_initial{col}(i+p-n,:);

I can't figure it out where is the problem, anyone help?

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Answer 1

Star Strider 2014-6-7

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https://ww2.mathworks.cn/matlabcentral/answers/132825-index-exceeds-matrix-dimensions-error-problem#answer_139771

I can tell you what’s wrong, but only you know how to fix them:

On the first iteration of the ‘j’ loop, m=1, so j can’t go from 1 to zero unless you tell it to decrement. So j is empty.

In the line throwing the error that assigns b, i is a (1x4) vector that in this situation isn’t allowed as a subscript defining b,a scalar.

They may be other problems, but you have to fix these first to get your code to run.

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Answer 2

SRI 2014-6-7

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Check For the size of the m and n which may exceeds the level beyond the loop, so you face this error. instead try changing range for m it may result better