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From: kzin lin on 1 Mar 2010 02:30

HI all,
it is very useful question and answer, i got it. i got the same error and now i try with this command. thz to all ;P



"Manos " <ezoulias(a)in.gr> wrote in message <glaiuo$j39$1(a)fred.mathworks.com>...
> Hi everyone,
>
> I am an old user of Matlab and I try to use SVM (support vector machines) for some classification.
>
> I use the following code
>
> for i=1:1:4
>
> sensitivitytotal1150 = 0;
> specificitytotal1150 = 0;
>
> %This is a custom function that I ahve been using for a long time and works for %other SVM methods
> [HeadLines,ind0,ind1,ind2,ind3,ind4,ind5,ResultsNM,ResultsM,ResultsNMold,ResultsMEid1,ResultsMEid0,ResultsNMEid1,ResultsNMEid0,YResultsMEid1,YResultsMEid0,YResultsNMEid1,YResultsNMEid0,YResultsNM,YResultsM,YResultsNMold,NMT1,NMT0,NMTY1,NMTY0,MT1,MT0,TotalResult,YResultsTotal,TotalTestResult,YResultsTestTotal,TotalTestResulta,TotalResulta] = split_to_test_training_sets_for_suspicious_spec(textdata,data,0.2,1);
>
> SVMstruct1150 = svmtrain(TotalResult,YResultsTotal,'Kernel_Function','mlp','Method','QP');
> classes1150 = svmclassify(SVMstruct1150,TotalTestResult);
> cp1150 = classperf(YResultsTotal);
> cp1150 = classperf(classes1150,YResultsTestTotal);
>
> sensitivitytotal1150 = sensitivitytotal1150 + cp1150.sensitivity;
> sensitivityaverage1150 = sensitivitytotal1150 / i;
>
> specificitytotal1150 = specificitytotal1150 + cp1150.specificity;
> specificityaverage1150 = specificitytotal1150 / i;
>
> sensitivityall1150(i,:) = cp1150.sensitivity;
> specificityall1150(i,:) = cp1150.specificity;
>
> sensitivityall1150(i+1,:) = sensitivityaverage1150;
> specificityall1150(i+1,:) = specificityaverage1150;
>
> %sensitivityall1150
> sensitivityall1150
>
> %specificityall1150
> specificityall1150
> end
>
> End I receive the following error
> ??? Error using ==> svmtrain at 470
> Unable to solve the optimization problem:
> Maximum number of iterations exceeded; increase options.MaxIter.
> To continue solving the problem with the current solution as the
> starting point, set x0 = x before calling quadprog.
>
> Have you got any idea what is the meaning of it?
> Hoa can I increase options.MaxIter.??
> How can I set x0 = x before calling quadprog.
>
> It will be very helpfull for me if you can give me a solution.
>
> Than you in advance,
> Best regards,
> Emmanouil Zoulias
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