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Hi, Are you using the GUI to set this up? If not then I'd recommend trying that first. If you are and you've checked the issues raised previously (Is the data OK? Is the design rank deficient?) then the next step would be to upload your design.fsf file together with all of the custom files used to specify the EVs. You can upload these to: http://www.fmrib.ox.ac.uk/cgi-bin/upload.cgi and make sure to send us the 6 digit reference number. Also, it would be helpful to have the output of fslhd and fslstats -r -R on your input 4D functional images. All the best, Mark On 3 Jan 2012, at 02:18, Xu Wang wrote: > Dear FSL experts: > I have tried to find the previous problem, and still not resolved, When I run feat_model command on a 9 regressors(each 240 time points) and 9 regressors' derivates(set fmri(deriv_yn9) 1) model, totally 18 regressors, > the error came out like this: > terminate called after throwing an instance of 'NEWMAT::SubMatrixDimensionException' > If I reduce the number of derivates to less than five, the feat_model can work successfully. > I have no idea about this :( > Thanks very much! > Xu Wang