Error-Performing cross validation rbf

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FIR
FIR 2012-8-28
I have a set of code
load fisheriris
indices = crossvalind('Kfold',species,10);
group1=[1;2;2;1;1;2;1;2;1;2]
group = cellstr(num2str(group1))
cp = classperf(species);
for i = 1:10
test = (indices == i); train = ~test;
net = newrb(meas(:,1),group1);
b=meas(:,3);
Y=sim(net,b);
classperf(cp,Y,test);
end
but i get error ,please help
Error using ==> classperf at 163
When class labels of the CP object is a cell array of strings and
the classifier output is a numeric array, it must contain valid
indices of the class labels or NaNs for inconclusive results.
Error in ==> Untitled at 13
classperf(cp,Y,test)

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