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

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n
n 2011-2-15
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

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回答（1 个）

n
n 2011-2-17
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);

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