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Dear Diane, It's not clear from the error message you sent where the error occurs so it's hard to know what the problem is. In general for now in SPM8 you should always convert your data to average reference. This might change in the future. You can use spm_eeg_montage to do that and there are detailed instructions in the manual for how this is done. If that doesn't help, send me the example (you can use yousendit.com) and I'll look at it. Best, Vladimir On Tue, Jun 16, 2009 at 12:37 PM, Diane Whitmer<[log in to unmask]> wrote: > Dear SPMers, > > I am using SPM8 with EEG data. When I try to compute the Inverse solution, I > get the following error message: > > Warning: Matrix is singular, close to singular or badly > scaled. > Results may be inaccurate. RCOND = NaN. > > > Does anyone have suggestions for how to debug this? > > A subset of these data previously worked for computing an Inverse Solution. > One difference with my current dataset is that I have re-referenced to one > of the EEG channels (because it's not clear that SPM selects a reference > channel when importing from Biosemi). This may or may not be related to the > problem I'm having. > > > Thank you, > -- > Diane Whitmer, Ph.D. > Researcher in Applied Neuroscience > > C. de l' Observatori Fabra s/n > 08035 - Barcelona - Spain > tel. +34 93 254 03 68 > fax. +34 93 212 64 45 > skype. dwhitmer > email. [log in to unmask] > ______________________________________ > STARLAB, Living Science http://www.starlab.es > > This e-mail and the attached files contain confidential information and are > of exclusive use for the addressee. The disclosure, copy and distribution of > the present message and its attachments are prohibited. If you are not the > intended recipient and you receive this communication, we inform you that it > is forbidden by law to read, copy or use it. Please notify us at > [log in to unmask] and proceed immediately to delete it. >