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Index must be a positive integer less than or equal to the number of test sets.

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Joana
Joana on 11 Dec 2019
Edited: Adam on 11 Dec 2019
Hi
i'm trying to create 10-fold cross validation for my CNN. To create the 10 batches I'm using a for loop, but it's giving this error again and again.
'Index must be a positive integer less than or equal to the number of test sets.'
Possibly how I can change the loop to initialize batches.?
selectBatch=cell(1,10);
for k=1:10
%%Prep Data
% 10 kfold crossvalidation indicies
c = cvpartition(204,'kfold',10);
testInd = test(c,selectBatch(k));
trainInd = ~testInd;
epochsTarget = zeros(204,1);
epochsTarget(103:end)=1;
epochsTarget= categorical(epochsTarget);
...............
end

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Image Analyst
Image Analyst on 11 Dec 2019
Read this link, then give us the full error. That means ALL the red text, including the line number and line of code it fails on.
Joana
Joana on 11 Dec 2019
Sorry if my question did not make sense.
This is the full error:
Error using internal.stats.cvpartitionImpl>checkindex (line 441)
Index must be a positive integer less than or equal to the number of test sets.
Error in internal.stats.cvpartitionImpl/test (line 229)
checkindex(i,cv.NumTestSets);
Error in cvpartition/test (line 229)
testIndices = test(cv.Impl,varargin{:});
And it is possible due to this line of the code:
testInd = test(c,selectBatch(k));
Because when I run the code withourt for loop, and with a fixed parameter of 'selectBatch' the code runs okay, but it doesn't work with the for loop.
Image Analyst
Image Analyst on 11 Dec 2019
The error message says your line of code throwing the error is
testIndices = test(cv.Impl,varargin{:});
not
testInd = test(c,selectBatch(k));
When you set a breakpoint on line 229 of your program, what are the values of cv.Impl and varargin{:}? Why are you sending in varargin anyway???

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Answers (1)

Adam
Adam on 11 Dec 2019
Edited: Adam on 11 Dec 2019
selectBatch(k)
is a cell array, which clearly is not an integer.
selectBatch{k}
may be what you want instead.
That said, your cell array also appears to be empty anyway.

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