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What is Index exceeds matrix dimensions.error?

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Subhankar  Singha
Subhankar Singha on 23 Apr 2015
Closed: MATLAB Answer Bot on 20 Aug 2021
Sir I am facing this error. I cannot understan what it really means.
Error in singha>VALIDATE_Callback (line 506) s2 = std2(cimg(:,:,2));
Error in gui_mainfcn (line 96) feval(varargin{:});
Error in singha (line 42) gui_mainfcn(gui_State, varargin{:});
Error in @(hObject,eventdata)singha('VALIDATE_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback

Answers (1)

Adam
Adam on 23 Apr 2015
Edited: Adam on 23 Apr 2015
Arrays/matrices have a dimension which you can check by
size( myArray );
Indexing into an array using an index greater than the size in the specified dimension leads to this error.
e.g. if you have a 3*3 array, myArray , both the following will yield this error:
myArray(3,4); % 4 exceeds the 2nd dimension size
myArray(2,2,3); % 3 exceeds the 3rd dimension size as there is no 3rd dimension
From this you should be able to see what is going wrong in your own code by debugging and since this is something fundamental to learn in Matlab it is better for your learning that you locate it rather than someone point out the error.
  3 Comments
Subhankar  Singha
Subhankar Singha on 26 Apr 2015
Sir the error says this Attempted to access test(1,495,2); index out of bounds because size(test)=[512,512,1]. No matter what i do the third dimension in test always exceeds the 3rd value , which is "2" in this case. I am attaching me new codes.Sir please look at the code, I will be very thankful to you if you coorect the entire code. Looking forward to your much needed help.
Adam
Adam on 27 Apr 2015
You have already discovered the cause of the error yourself. Finding a solution for it is down to you working out what your matrices should be and what size they should be rather than something that can just be fixed by Matlab knowledge alone.

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