question about the .previous field

Jan Mathijs Schoffelen jan.schoffelen at FCDONDERS.RU.NL
Fri Oct 26 10:34:03 CEST 2007


Dear Nicolas,

The .previous field which is appended to the output-structure's cfg-field is not mandatory for fieldtrip. It's just in order to keep track of the configuration settings of the analysis steps earlier in the pipeline. Thus you can safely remove them.

Yours,

Jan-Mathijs

----- Original Message -----
From: Nicolas Robitaille <enteka at HOTMAIL.COM>
Date: Thursday, October 25, 2007 1:50 am
Subject: [FIELDTRIP] question about the .previous field

> Dear fieldtrip developper,
> 
> I would like to know if the .previous field is mandatory for 
> current or future usage of fieldtrip. If not, I will remove them 
> within my script.
> 
> I observe that, for instance while looking at the output of 
> timelockgrandaverage, the nested structures contain all the 
> original triggers (avg.cfg.previous{}.previous.event) in the file. 
> In my case, this end up being a 25 Megabytes variable for an ERP of 
> 2 sec for 3 electrodes!! Thanks to automatic compression by Matlab, 
> the saved file is very small (700 k), but loading it on my computer 
> take more than 6 sec, which end up having drawing routines of very 
> simple data to take minutes. 
> 
> Thanks
> 
> Nicolas
> 
> ************************************
> Nicolas Robitaille, candidat Ph.D
> Département de Psychologie
> Université de Montréal
> C.P. 6128, succursale Centre-ville
> Montréal, Québec H3C 3J7
> Tel.: 514-343-6111 x2631
> Fax: 514-343-5787
> ************************************
> 
> _________________________________________________________________
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> ----------------------------------
> The aim of this list is to facilitate the discussion between users 
> of the FieldTrip  toolbox, to share experiences and to discuss new 
> ideas for MEG and EEG analysis. See also 
> http://listserv.surfnet.nl/archives/fieldtrip.html and 
> http://www.ru.nl/fcdonders/fieldtrip.
>

----------------------------------
The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/fcdonders/fieldtrip.



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