MATLAB: Parameter optimization of support vector machine

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hi i am new in matlab , i am using support vector machine for parameter optimizing purpose.I using the sample code which is given below-
 grnpop = mvnrnd([1,0],eye(2),10);
>> redpop = mvnrnd([0,1],eye(2),10);
>> redpts = zeros(100,2);grnpts = redpts;
>> for i = 1:100
grnpts(i,:) = mvnrnd(grnpop(randi(10),:),eye(2)*0.2);
redpts(i,:) = mvnrnd(redpop(randi(10),:),eye(2)*0.2);
end;
>> k=10;
>> cdata = [grnpts;redpts];
grp = ones(200,1);
% green label 1, red label -1

grp(101:200) = -1;
>> cdata = [grnpts;redpts];
grp = ones(200,1);
% green label 1, red label -1
grp(101:200) = -1;
>> cvFolds = crossvalind('Kfold', grp, 10);
>> z=[3 5];
>>  testIdx = (cvFolds == 1);
>> trainIdx = ~testIdx;
>> xtrain=cdata(trainIdx,:);
>> xtest=cdata(testIdx,:);
>> ytrain=grp(trainIdx);
>> svmStruct = svmtrain(xtrain,ytrain,'Kernel_Function','rbf',...
   'rbf_sigma',z(1),'boxconstraint',z(2));
>> yfit = svmclassify(svmStruct,xtest);
>> minfn = @(z)crossval('mcr',cdata,grp,'Predfun',yfit,.....
    @(xtrain,ytrain,xtest)crossfun(xtrain,ytrain,...
    xtest,exp(z(1)),exp(z(2))));
>> opts = optimset('TolX',5e-4,'TolFun',5e-4);
>> [searchmin fval] = fminsearch(minfn,randn(2,1),opts)
but i found the following error-
Error using crossval (line 204)
Wrong number of arguments.
Error in
@(z)crossval('mcr',cdata,grp,'Predfun',yfit,@(xtrain,ytrain,xtest)crossfun(xtrain,ytrain,xtest,exp(z(1)),exp(z(2))))
Error in fminsearch (line 191)
fv(:,1) = funfcn(x,varargin{:});
please any one tell me why this error is comeing ,and also suggest the code.

Best Answer

You seem to be looking at this example from the documentation. Copy the example carefully, I guarantee that it runs as shown.
Alan Weiss
MATLAB mathematical toolbox documentation
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