error using fuzzy interface

x = (0:0.1:10)';
y = sin(2*x)./exp(x/5);
trnData = [x y];
numMFs = 5;
mfType = 'gbellmf';
outmfType='linear';
epoch_n = 20;
in_fis = genfis1(trnData,numMFs,mfType,outmfType);
out_fis= anfis(trnData,in_fis,epoch_n);
plot(x,y,x,evalfis(x,out_fis));
legend('Training Data','ANFIS Output');

this is the error

Error using subsindex
Function 'subsindex' is not defined for values of class 'struct'.

[Geoff Hayes]

Hossam - which line of code does this error correspond to? Try copying and pasting the above code into a script or function (m file) and then run it. The error message should now point to the line of code that is throwing the error. Copy and paste that information into your question and hopefully someone will be able to offer some guidance on how to solve the problem.