[FieldTrip] Fieldtrip ICA crashes Matlab

Wed Apr 2 17:10:52 CEST 2014

Hi Hweeling,

Could you please copy and paste the exact error message Matlab is
producing? Also, which version (e.g. 2013a) of Matlab are you using?

Best,

Jim

From: fieldtrip-bounces at science.ru.nl
[mailto:fieldtrip-bounces at science.ru.nl] On Behalf Of Hwee Ling Lee
Sent: maandag 31 maart 2014 17:25
To: Stephen Politzer-Ahles; FieldTrip discussion list
Subject: Re: [FieldTrip] Fieldtrip ICA crashes Matlab

Hi,

Thanks for your reply. I'm running Matlab with 64 bit. I've got 32GB of
RAM installed. In the previous month, I was able to run ICA and plot its
components without any error message from Matlab. Recently, I keep
experiencing the error message, and Matlab crashes completely. I have no
clue what could have gone wrong.

Cheers,

Hweeling

On 31 March 2014 17:08, Stephen Politzer-Ahles <politzerahless at gmail.com>
wrote:

Hello Hweeling,

What kind of error do you get in MATLAB when you try to do ICA, is it an
"Out of memory" error? I'm asking because this is a fairly common issue in
MATLAB on Windows systems (I don't know the details of your data, but I've
experienced this issue on 32-channel, 1000-Hz epoched EEG data if the
epochs are long enough and numerous enough). For me the only solutions
(other than shortening the epochs or downsampling the data, which might
not be good options depending on your research question) were to use a
Unix-based operating system (like Mac OS) or to upgrade my Windows (I had
errors like this when using a 32-bit version of Windows with 2 GB of RAM,
but not so much after I upgraded to 64-bit and 8 GB of RAM). I'm not sure
if this is the issue you're having, though.

Best,

Steve

Stephen Politzer-Ahles
New York University, Abu Dhabi
Neuroscience of Language Lab
http://www.nyu.edu/projects/politzer-ahles/

On Mon, Mar 31, 2014 at 7:02 PM, <fieldtrip-request at science.ru.nl> wrote:

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Today's Topics:

   1. Fieldtrip ICA crashes Matlab (Hwee Ling Lee)
   2. Re: plotting interpolated sources with ft_sourceplot
      (J?rn M. Horschig)
   3. Re: help about ' fieldtrip2fiff ' (Gio Piantoni)

----------------------------------------------------------------------

Message: 1
Date: Mon, 31 Mar 2014 16:48:34 +0200
From: Hwee Ling Lee <hweeling.lee at gmail.com>
To: FieldTrip discussion list <fieldtrip at science.ru.nl>
Subject: [FieldTrip] Fieldtrip ICA crashes Matlab
Message-ID:

<CABG7z0SPtmOfGWxqRxiveg+cfUewJ8p8P-v9=poVtb-1ApZuDQ at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Dear all,

I'm encountering a problem with running ICA in Matlab. After ICA, when I
tried to plot the components, Matlab keeps prompting an internal problem
and needs to be closed. I wonder why this is the case. Could someone
please
tell me what went wrong?

Here's part of my script for ICA:

        cfg = []; % if data were cleaned, then use this

        if sub == 5 %|| sub == 7
        cfg.channel = {'all', '-AFz', '-FT7'};
         elseif sub == 7
         cfg.channel = {'all' '-AFz'};
       else
            cfg.channel = {'all'};
        end

        % cfg.runica.pca = 121; % using the rank of my data
        % ic_data = ft_componentanalysis(cfg,cleandata); % if data were
cleaned then use this
        ic_data = ft_componentanalysis(cfg, cleandata);

        % after ICA, look for components that we want to substract from
our
data,
        % only looking at ten channels (components) at a time
        cfg = [];
        cfg.dataset = rawdatafile;
        cfg.viewmode = 'component';
        cfg.continuous = 'no';
        cfg.blocksize = 8;
        cfg.channels = 'all';
        cfg.layout = 'EEG1020.lay';
        ft_databrowser(cfg,ic_data);

The internal problem appears even when I downsampled my data from 5000 Hz
to 1000 Hz.

The internal problem appears also when I have short segments of my data
(i.e. 2s per trial), and long segments of my data (i.e. 6s per trial).

The memory of my PC workstation is:
Maximum possible array:     60253 MB (6.318e+10 bytes) *
Memory available for all arrays:     60253 MB (6.318e+10 bytes) *
Memory used by MATLAB:       560 MB (5.872e+08 bytes)
Physical Memory (RAM):     32685 MB (3.427e+10 bytes)

Interestingly, this internal problem does not occur when I ran my script
on
my Macbook Pro.

I'm feeling very lost here. Any help is highly appreciated.

Cheers,
Hweeling
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-- 

=================================================
Dr. rer. nat. Lee, Hwee Ling
Postdoc
German Center for Neurodegenerative Diseases (DZNE) Bonn

Email 1: hwee-ling.lee<at>dzne.de
Email 2: hweeling.lee<at>gmail.com

https://sites.google.com/site/hweelinglee/home

Correspondence Address:
Ernst-Robert-Curtius Strasse 12, 53117, Bonn, Germany
=================================================

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