Is it possible to have control on C parameter of SVM in Matlab ?

Hi,

I have seen the following question and answer:

http://mathforum.org/kb/message.jspa?messageID=3735688&tstart=0

but it seems to be too complicated! are there any other ways perhaps in newer versions of bioinoformatic toolbox to have control on C parameter of SVM? or somehow have control on how SVM parameters are being optimized?

Thanks

Answer 1

[n]

Here is an example of using 'QuadProg_Opts' option in svmtrain:

myoption = optimset('PrecondBandWidth',2);

 % this is the ub parameter of quadprog I guess
svmStruct =svmtrain(train_data,train_label,'Kernel_Function','rbf','RBF_Sigma', 0.5,'QuadProg_Opts', myoptions);

But the C value seem to be relative to box constrain as used in the example of svmtrain:

svmStruct = svmtrain(data(train,:),groups(train),...
                     'showplot',true,'boxconstraint',1e6);