How to set Sigma value in CompactClassificationSVM in Matlab

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I'm new to Matlab and I would like to set the value of Sigma for the class CompactClassificationSVM
I couldn't find away to set it's value. I tried for example;
But I got the error message:
Error using subsref
No appropriate method, property, or field 'Sigma' for class 'ClassificationECOC'.
Any clue?

Accepted Answer

Ilya on 1 Jul 2015
Binary SVM models trained by ECOC are saved in the BinaryLearners property, which is a cell array. You can't change the Sigma property (it's not writable), but you can see what it is for all learners.

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