[Eeglablist] Out of Memory issues

[Dwight Peterson]

Thank you all for your kind replies!

Solution I implemented:
I have used 'decimate' within matlab to create a downsampling factor
function wherein I can load my raw EEG data file and then use this function
to decrease my sampling rate prior to importing to EEGLAB.  I will work
with the EEGLAB 12 as well!

Regards,

--Dwight--

On Sun, Sep 30, 2012 at 1:21 PM, Arnaud Delorme <arno at ucsd.edu> wrote:

> Dear Dwight,
>
> try out EEGLAB 12 (currently requires SVN download but you may wait one or
> two weeks until we release a zip file) as it has full memory mapping
> implementation. This should solve most of the memory errors.
> Best,
>
> Arno
>
> On 25 Sep 2012, at 05:35, Matthew Zivot wrote:
>
> > I played around with converting the data to a unsigned 16bit integer
> > (unit16). This greatly reduced the storage size of each file, which is
> > currently read in as a double. As far as I am aware, EEG polarity is
> > always positive, and less than 2^16.
> >
> > Quoting Jim Parkinson <jimparkinson at me.com>:
> >
> >> Matlab is pretty ropey at memory management. What's more, if you're
> >> running 32 bit Matlab, the maximum physical memory it can use, i
> >> think, 4gb, irrespective of how much your machine has. So my short
> >> answer (and the most effective long term, IMO) is to get more RAM
> >> and 64 bit Matlab. The former is dead cheap these days, the latter
> >> not so, I'm afraid! :-)
> >>
> >>
> >> ------------------------------------------------
> >> Dr Jim Parkinson, PhD
> >>
> >> Postdoctoral Researcher,
> >> Body and Action Group,
> >> Institute of Cognitive Neuroscience,
> >> UCL,
> >> Alexandra House
> >> 17 Queen Square
> >> London WC1N 3AR
> >>
> >> Tel: +44 207679 5431
> >>
> >> jimparkinson at me.com
> >> jim.parkinson at ucl.ac.uk
> >>
> >> On 21 Sep 2012, at 22:32, Dwight Peterson
> >> <dwight.peterson23 at gmail.com> wrote:
> >>
> >>> Hi all,
> >>>
> >>>       I am getting an output message of OUT OF MEMORY quite often
> >>> when attempting to use certain functions within EEGLAB.  For
> >>> example, this OUT OF MEMORY message occurs when I try to re-sample
> >>> my dataset after it has been successfully loaded in to EEGLAB. The
> >>> reason I am trying to re-sample is because our data acquisition
> >>> system is extremely high resolution, however, this leads to memory
> >>> issues given that the sampling rate is 48000 Hz.   Because we are
> >>> limited in terms of our equipment, I was trying to re-sample to a
> >>> smaller sampling rate, but I keep getting this error message.
> >>> Also, this error message comes up when I try to load in a saved
> >>> continuous EEG dataset that I have already processed.  However, if
> >>> I re-create the eeg dataset from the beginning (e.g., import > from
> >>> .mat array) there is no such error message.
> >>>       I have already tried the memory options within the File menu
> >>> of the EEGLAB GUI.
> >>>
> >>>       Any suggestions would be most appreciated!
> >>>
> >>> Thanks!
> >>>
> >>> --Dwight--
> >>>
> >>> --
> >>> Dwight J. Peterson, M.A.
> >>> Graduate Assistant
> >>> Cognitive and Brain Sciences
> >>> Department of Psychology/296
> >>> Memory and Brain Laboratory
> >>> University of Nevada, Reno
> >>> Reno, NV 89557
> >>> Cellular: 319-231-8596
> >>> Laboratory: 775-682-8667
> >>>
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> >
> >
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-- 
Dwight J. Peterson, M.A.
Graduate Assistant
Cognitive and Brain Sciences
Department of Psychology/296
Memory and Brain Laboratory
University of Nevada, Reno
Reno, NV 89557
Cellular: 319-231-8596
Laboratory: 775-682-8667
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