[Eeglablist] pop_eegfiltnew help

[Ahmad, Jumana]

Hi all,
Thank you for your reply Yamil.
How do I get the GUI to not use a reverse filter? I am only using the GUI to get an automatic setting for the filter length/order. If I now swapped the location of the 1, and set the reverse to false should the filter order change?
Do I have to repeat the filtering I've already done? Or is it equivalent?
Thank you and best wishes,
Jumana


On 29 Nov 2016, at 18:03, Yamil Vidal Dos Santos <hvidaldossantos at gmail.com<mailto:hvidaldossantos at gmail.com>> wrote:


Hi,
Is because the 5th parameter (revfilt) is set to true, which indeed reverses the direction of the filter, turning the lowpass into a hipass.
I was also confused the first time.
Cheers,
Yamil

On 29 Nov 2016 18:55, "Ahmad, Jumana" <jumana.ahmad at kcl.ac.uk<mailto:jumana.ahmad at kcl.ac.uk>> wrote:
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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