[FieldTrip] problems with speed of processing

Michael Stephan Michael.Stephan at esi-frankfurt.de
Wed Jul 11 11:40:17 CEST 2012

Dear Eliana,

if your data sets vary in size you should sort them according to size 
and then process them starting with the largest data set.

Michael Stephan
Ernst Strüngmann Institute for Neuroscience
in Cooperation with Max Planck Society
Deutschordenstraße 46
D-60528 Frankfurt am Main

eMail: Michael.Stephan at esi-frankfurt.de

> Hello Dear Fieldtrip Community,
> I am having now problems with processing my data. I am analyzing a quite
> big data set with 400 trials that are composed by 10 sec (re-sampled at
> 150Hz). I am doing first a demean, then planar gradient transformation,
> time-frequency analysis using multitapers and then combine the planar
> gradient again. For the first subject always runs normally, but for the
> second one matlab gets really slow. I am taking care in deleting the
> variables that I create with big amount of data after I don't need them
> any more, so I am using just one big file that is being safe at the end
> (average time-frequency across trials) for each of the subjects. Every
> time matlab starts to analyze a new subject I am using clear all (with
> exceptions like directory and name of subject) but stills with every new
> subject it gets slower and slower.
> Do you have any advises to make the analysis faster? Sometimes is too
> slow and the computer normally crashes after 3 subjects.
> Thank you very much for the attention.
> Best,
> --
> Eliana García Cossio
> Applied Neurotechnology Lab.
> Graduate School of Neural and Behavioural Science - Max Planck Research
> School
> Institute of Medical Psychology and Behavioural Neurobiology
> Universität Tübingen
> (+0049) 01 577-8587604
> Otfried-Müller-Str. 47, 72076
> Tübingen- Germany
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