MATLAB Troubleshooting MATLAB Index Out of Bounds Error: Tips and Solutions

AI Thread Summary
The MATLAB error "index out of bounds" occurs when trying to access an element that doesn't exist in an array, as seen in the example where x(2) is accessed while numel(x)=1. The issue arises from the function fit_fun, which expects an array with three elements but is receiving an array with only one. To resolve this, the code needs to ensure that the input to fit_fun contains three elements during each iteration of the loop. Modifying the data structure or the loop condition to guarantee three valid inputs will prevent this error. Properly managing array dimensions is crucial for successful MATLAB coding.
dyfw
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Dear forummers,

I'm trying to solve a problem that is displayed in MATLAB below:-

? Attempted to access x(2); index out of bounds because numel(x)=1.

Error in ==> fit_fun at 5
Fit_fun_val= x(1)^2 + x(2)^2 + x(3)^2;

Error in ==> jack_immune at 47
Sel_Ab_cri(ksel)=fit_fun(Ini_Ab(:,ksel));

I understand that (Ini_Ab(:,ksel)) has to have 3 numbers/datas, but the coding is looping.
How am i able to modify the code as to have 3 numbers as well as a loop? Sorry for my poor explanation.

Part of the code is as below:-

for ksel=1:pop_size
Sel_Ab_cri(ksel)=fit_fun(Ini_Ab(:,ksel));
end

Thanks in advance.
PS: Do let me know if i need to post the full code. Thanks.
 
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dyfw said:
? Attempted to access x(2); index out of bounds because numel(x)=1.
You don't need to look at anything else. numel function returns the number of array elements. You attempted to access the 2nd element while the array has only one element.
 
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