[Eeglablist] laplacian time

[arno]

No this is normal. The del2map function is not optimized to work on 
continuous data. You could easily look at it to introduce a speed factor 
of more than 20 or more probably (I guess processing a dataset of 190 
000 should not take more than one hour). The computation of the 
laplacian is really fast. It is the interpolation which is slow. I have 
entered an enhancement suggestion in our Bugzilla system.

https://sccn.ucsd.edu/eeglab/bugzilla/show_bug.cgi?id=222

If you wish, just use the function eeg_interp which can compute faster 
interpolation (attached) and add some code to compute the laplacian

Best,

Arno

Maria L. Stavrinou wrote:
> Dear EEGLab creators and users
> We are trying to use the laplacian introduced into EEGLAB (the del2map 
> function). We use it on 60 channels on continuous data (a typical 
> dataset is about 190000 datapoints per channel, and it takes 
> approximately 1-2 days. That is normal, or we might be doing something 
> wrong?
>  
> Best regards,
> Maria
>  
> Maria L. Stavrinou PhD
> Biosignal Processing Laboratory,
> Department of Medical Physics,
> School of Medicine,
> University of Patras,
> Rio Campus, 26500, 
> Greece
> tel. lab. 0030-2610-966115
>  
> web page:
> http://nucleus.med.upatras.gr/~maria/hello.htm 
> <http://nucleus.med.upatras.gr/%7Emaria/hello.htm>
>  
>
>  
>
>  
>  
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