How can I train SVM in Matlab, with more than 2 classes?

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Diver 2015-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/225683-how-can-i-train-svm-in-matlab-with-more-than-2-classes

回答： Ilya 2015-7-1

Hi;

I was trying to use fitcsvm to train and classify my data. However, I notice - correct me if I'm wrong - that fitcsvm could only be used with 2 classes (groups).

My data have more than 2 classes. Is there away to do classify them in matlab?

I did some googling and I read that some recommend to use fitcecoc , while others recommend to use out of the box code multisvm

Morover, other recommend to use discriminant analysis

Please, advise on best approach to go.

Thanking you.

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Image Analyst 2015-6-29

Do you always know how many classes there will be? If so, why not try kmeans?

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Answer 1

Ilya 2015-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/225683-how-can-i-train-svm-in-matlab-with-more-than-2-classes#answer_184626

multisvm appears to be built on top of the older, slower svmtrain function, while fitcecoc uses the newer, faster C++ implementation. fitcecoc offers more options and gets MathWorks tech support.