[FieldTrip] Sourceplots suddenly have huge file size

"Jens Klinzing, Universität Tübingen" jens.klinzing at uni-tuebingen.de
Thu Oct 9 18:32:07 CEST 2014

Hi Erik,
wow, I really wouldn't have thought this could work ... but it did! It 
resulted in a reduction of the file size from 4.6 GB down to 9 MB (for 
the result of a statistical cluster permutation test).

I still have a brain with a very dark color, though. Does anyone know 
how to get rid of that?
Why would these things change without an obvious reason?

Thanks for your help, Eric!!
All the best,

Am 09.10.2014 13:46, schrieb Erik te Woerd:
> Hi Jens,
> The problem might be that the cfg.previous-structure is becoming quite 
> large. Try to clear this before plotting the data, like:
> data.cfg.previous = [];
> This is especially helpful when plotting grandaverage-data. (I've seen 
> cases in which the size went from 13 GB to 150 MB just by clearing the 
> cfg.previous)
> Best,
> Erik
> 2014-10-09 11:51 GMT+02:00 "Jens Klinzing, Universität Tübingen" 
> <jens.klinzing at uni-tuebingen.de <mailto:jens.klinzing at uni-tuebingen.de>>:
>     Dear fieldtrip community,
>     I encountered a weird problem. Lately, my source plots started to have
>     huge file sizes when I save them as figures (.fig). This applies
>     to both
>     slice and surface plots. Surface plots used to have around 3-7 MB, now
>     they have around 220 MB or even > 4 GB (ie. almost the size of the
>     plotted data set). They also look slightly different now, with the
>     surface being way darker than before. Slice plots look the same
>     but are
>     also larger than before.
>     The problem seems to be in the plotting process itself (not the
>     beamforming). When I plot older source localizations (which by the way
>     have the same file size, fields, and basic properties as newer
>     ones) the
>     problem is still there.
>     The code I am using for plotting did (to the best of my knowledge) not
>     change at all:
>     cfg                                     = [];
>     cfg.method                      = 'surface';
>     cfg.funparameter            = 'avg.pow';
>     cfg.maskparameter         = cfg.funparameter;
>     cfg.funcolormap              = 'jet';
>     cfg.projmethod                = 'nearest';
>     cfg.surfdownsample        = 5;
>     ft_sourceplot(cfg,data)
>     I thought it may be a change in fieldtrip so I reverted my
>     ft_sourceplot
>     to an older version but that did not help. I also used an older Matlab
>     version (currently I use 2013b but I also tried 2013a) and another
>     computer (Windows and Unix). In all cases I used opengl as the
>     renderer.
>     I am sure it is something very simple and I'm just too blind to
>     see it.
>     Any suggestions?
>     Thanks a lot for your help,
>     Jens
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