[FieldTrip] artifact rejection issue - Poles

Davide Rivolta drivolta81 at gmail.com
Fri Jul 8 15:00:27 CEST 2011

Deat all,

I am trying to run the tutorial scripts on a dataset I have. The sampling
rate here is 6000 Hz.

I cannot perform the artifact rejection.

Here is the error.

??? Error using ==> filter_with_correction at 42
Calculated filter coefficients have poles on or outside the unit circle and
not be stable. Try a higher cutoff frequency or a different type/order of
Error in ==> ft_preproc_bandpassfilter at 80
filt = filter_with_correction(B,A,dat,dir);
Error in ==> preproc at 281
if strcmp(cfg.bpfilter, 'yes'),     dat = ft_preproc_bandpassfilter(dat,
cfg.bpfreq, cfg.bpfiltord, cfg.bpfilttype, cfg.bpfiltdir); end

I have tried to change the cutoff, but the error is still present.

Has someone ever experienced this error?

Many thanks,

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