[Eeglablist] pop_eegfilt

[Arnaud Delorme]

Dear Yangqing,

the frequency at which you are trying to filter is too low. Using linear FIR filtering, your filter length is extremely long which is probably triggering the error you are seeing. You should try to use the non-linear filter. In practice we rarely filter below 0.5 Hz because ICA components quality dramatically decrease in case you do not high pass filter your data.
Some solutions exist to filter at lower frequencies. One of the EEGLAB compatible one is available within ERPLAB.

Best regards,

A. Delorme

On Jun 19, 2011, at 2:49 AM, Yangqing(Lucie) Xu wrote:

> Hi, 
> 
> I'm trying to use pop_eegfilt to do a bandpass filter. 
> 
> When I used pop_eegfilt( EEG, 0.01,80,[ ],0), it gave me the error that "Maximum variable size allowed by the program is exceeded."
> 
> Then I read the warning that bandpass filter may not work, and we should try first low pass and then high pass.  So I did 80 low pass first, which went fine, but when it was doing the low pass, it gave me the same error.  
> 
> Than I tried 80 low pass first, an then .05 high pass, and the error is now "Out of memory"
> 
> I'm not sure what is the minimum high pass that eeglab support.  Anybody have suggestions? '
> 
> Thanks!
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