does matlab 2015 support svm multiclass??

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I use matlab 2013b for programmation but this version does not support svm multiclass. my question there is another version that support svm for multi classification?

Accepted Answer

Walter Roberson
Walter Roberson on 22 May 2015
Edited: Walter Roberson on 22 May 2015
Not directly. There is ClassificationECOC
"ClassificationECOC is an error-correcting output codes (ECOC) classifier for multiclass learning by reduction to multiple, binary classifiers such as support vector machines (SVMs). Train a ClassificationECOC classifier using fitcecoc and the training data."
Real multiclass SVM is really slow and needs a lot of memory, and is considered "feasible" (under a loose sense of the word) for at most 3 classes, and "possible if you are willing to wait several days" for 4 classes, but a matter for supercomputer clusters for 5 or more classes.
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Walter Roberson
Walter Roberson on 23 May 2015
It looks to me as if it can handle a large number of classes, but the computation is going to involve a decision matrix which is potentially large; see <http://www.mathworks.com/help/stats/classificationecoc-class.html#bue4w15 Coding Design" for how many rows the matrix would have.
I have not investigated how to interpret the various kinds of decision outputs.

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