How do I resolve the Index exceeds array elements?

Hi,

I am having trouble resolving this Index exceeds number of array elements. I am processing two images of different array elements and I am getting the error of Index exceeding the array elements. Can you help me fix the error and why is it happening?

%---FOR EVERY CELL GO FROM VERTEX TO VERTEX AND COUNT PIXELS AND DISTANCES--
failed=[];

for i=1:numel(PPm)
    
    [~, index]=sort(angle(complex(v{i}(:,1)-XXm(i), v{i}(:,2)-YYm(i))));
    Indexi{i}=[index; index(1)]';
    Vertex{i}(:,1)=v{i}(Indexi{i},1); Vertex{i}(:,2)=v{i}(Indexi{i},2); %now they are sorted clockwise 
    
    for zlj=1:numel(index)
        Edges(zlj)=pdist2([Vertex{i}(zlj,1) Vertex{i}(zlj,2)], [Vertex{i}(zlj+1,1), Vertex{i}(zlj+1,2)]);
    end
    
    Mean_edge_streight(i)=mean(Edges);
    Std_edge_streight(i)=std(Edges);       
    
    clear Edges   
    
    number_of_pixels=0;
    it_was_wrong_direction=0;
    Numb=numel(Vertex{i}(:,1));
    zlj=0; NUM_PIXELS_EDGE=0;
    
    for Try_it=1:Numb*2
        
        if it_was_wrong_direction==0
            zlj=zlj+1;
        end

Thank you in advance..

[Jan]

The code cannot run dues to the missing end statements. You did not reveal the important detail, in which line the error occurs. Whenever you mention an error in the forum, attach the compelete message. The details matter.

Can you provide some input data, e.g. created by rand?

This time I've edited your message and applied a proper formatting. Use the tools on top of the edit field to mark code as code. Thanks.

[Shree Charan]

Hey @Madhura Ramani, "Index exceeds number of array elements" occurs when a variable is indexed at a position higher than the length of the array. It might be useful to share the values of variables so as to repoduce the error.

Answer 1

[Keerthi Reddy]

Hi Madhura,

The error "Index exceeds number of array elements" occurs when you try to access an element in an array using an index that is greater than the number of elements in the array. From the above code snippet which you have mentioned, this error is likely happening in the following line:

Edges(zlj)=pdist2([Vertex{i}(zlj,1) Vertex{i}(zlj,2)], [Vertex{i}(zlj+1,1), Vertex{i}(zlj+1,2)]); 

This error is occurring because the variable Edges is not pre-allocated with a fixed size, and you are trying to access elements beyond the current size of the array.

Hope this helps.