How can I calculate and store the value of decision function of SVM using LIBSVM (MATLAB interface)?

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Bekk Okk

Ms Kripal. There is another pack called joakim SVM pack that give as an option to enter the rbf function. So try it It could help you:

use the -u option of the svmlight to introduce user defined kernel.

http://svmlight.joachims.org/

Mainak Basu

Dear Ma'am

If you wish to create a cascaded SVM system, that first uses the RBF kernel and then you own kernel function in LibSVM, I believe you will have to write a function for your kernel function in the primary LibSVM file, i.e. for svmtrain(), and you shall also need to set an option, that can be assigned from within your program in Matlab. Then you will have your own customized kernel. As for cascading the system, it need be done in Matlab only... But I do agree with the previous answer, that this procedure is extremely complex, and SVM-Light may serve your purpose better.

Krupal Parikh

Thanks Bekk & Basu. I will try to solve my problem using svm-

light