Why does my for-loop nested in an if-statement not work?

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F S 2016-7-20

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https://ww2.mathworks.cn/matlabcentral/answers/296421-why-does-my-for-loop-nested-in-an-if-statement-not-work

评论： F S 2016-7-20

I have an for-loop inside an if-statement nested again in another for-loop (I know sounds complicated, example below), which seems to run perfeclty, as long as until the loop is called the SECOND time. Then it gives me the error:

Index exceeds matrix dimensions.
Error in code (line 50)
imb=squeeze(B_proc(n,:,:));

Does anybody have an idea why?

Here the simplified for-if-for-loop:

 k=1;
 for i=2:length(proc_core)
    proc=cell2mat(proc_core(i,2));
    sz=size(proc);
    l=sz(1);
    vs=cell2mat(proc_core(i,3));
    if sz(2)==512 && sz(3)==512 && vs==2.5
        kl=k+l-1;
        Core(k:kl,:,:)=proc;
        k=k+l;
    elseif vs==2.5
        for n=1:length(proc)
        imb=squeeze(proc(n,:,:));
        imb=imresize(imb,[512 512]);
        Core(k,:,:)=imb;
        k=k+1;
        end
    end
 end

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Answer 1

Walter Roberson 2016-7-20

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length(proc) is defined as:

if isempty(proc)
  length = 0
else
  length = max(size(proc))
end

You, however, used length(proc) as if it were defined as size(proc,1) . If one of the other dimensions of proc is bigger than the number of rows then that bigger dimension is the length.