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Hi Holly, This warning always appears for the single shell model. It has something to do with too closely located mesh vertices and does not indicate a problem. Best, Vladimir On Thu, Jan 27, 2011 at 12:51 PM, Holly Rossiter <[log in to unmask]> wrote: > Hi Vladimir, > > I am trying to coregister MEG data with the individual's structural MRI for > the first time and am just clicking on the MRI to define where the fiducials > were. When I invert it, it gives me this warning... > > Checking leadfields for subject 1 > computing surface normals > Warning: Matrix is close to singular or badly scaled. > Results may be inaccurate. RCOND = 1.348811e-017. > > Does this mean that the 3 fiducials are nearly all in the same plain and > what are the consequences of it being badly scaled/singular? > > Thanks, > > Holly > > -----Original Message----- > From: Vladimir Litvak [mailto:[log in to unmask]] > Sent: 26 January 2011 15:35 > To: Holly Rossiter > Cc: [log in to unmask] > Subject: Re: MEG continuous data > > Hi Holly, > > When you convert the data do 'define settings' instead of 'just read' > and then choose 'continuous' and answer 'yes' to 'read across trial > borders'. > > Best, > > Vladimir > > On Wed, Jan 26, 2011 at 3:30 PM, Holly Rossiter > <[log in to unmask]> wrote: >> Dear Vladimir, >> >> >> >> I have recorded some MEG data as 12 trials of 60 seconds. I now want to >> epoch the data based on the triggers in the dataset but it will not let me >> as it says it is not continuous data. Can you tell me how to make my data >> into one long trial? >> >> >> >> Kind regards, >> >> >> >> Holly > >