[Eeglablist] pop_eegfiltnew help

[Andreas Widmann]

Dear Jumana,

the command line interface is indeed confusing here, I agree. This is due to historical reasons to maintain complete backward CLI compatibility with deprecated pop_eegfilt.

If the revfilt flag is true (as in your case) the filter is inverted. An inverted low-pass filter is a high-pass filter. Both versions,
EEG1 = pop_eegfiltnew(EEG, [], 1, 1650, true, [], 1);
and
EEG2 = pop_eegfiltnew(EEG, 1, [], 1650, false, [], 1);
give bit-identical results.

Hope this helps,
Andreas

> Am 28.11.2016 um 11:23 schrieb Ahmad, Jumana <jumana.ahmad at kcl.ac.uk>:
> 
> Dear all,
> I am trying to create a 1Hz dataset. I followed your advice to do this first with the GUI. As I want a high pass filter of 1Hz I entered 1 into the lower edge of the frequency pass band.
> In EEGlab history this gave:
>  
> EEG = pop_eegfiltnew(EEG, [], 1, 1650, true, [], 1);
>  
> However, is the 1 not in the wrong place now? Should not the high pass value go first? From above it seems like [] and 1 should swap places? 
>  
> I thought the function was: function [EEG, com, b] = pop_eegfiltnew(EEG, locutoff, hicutoff, filtorder, revfilt, usefft, plotfreqz)
>  
> Thank you,
> Jumana 
>  
> ------------------------------------------
> Jumana Ahmad
> Post-Doctoral Research Worker in Cognitive Neuroscience 
> EU-AIMS Longitudinal European Autism Project (LEAP) & SynaG Study
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