[Eeglablist] about function spectopo()

[Stephen Politzer-Ahles]

Hi Huibin,

Regarding the algorithm used:
http://sccn.ucsd.edu/eeglab/allfunctions/spectopo.m says "If available,
uses pwelch() from the Matlab signal processing toolbox, else the EEGLAB
spec() function."

Best,
Steve Politzer-Ahles

On Wed, Feb 22, 2012 at 7:55 PM, Nikola Tesla <420247417 at qq.com> wrote:

> Dear Sir,
>      The usage of function spectopo()  is :
>         >> spectopo(data, frames, srate);
>         >> [spectra,freqs,speccomp,contrib,specstd] = ...
>                      spectopo(data, frames, srate, 'key1','val1',
> 'key2','val2' ...);
> And   data = If 2-D (nchans,time_points); % may be a continuous single
> epoch,
>                  else a set of concatenated data epochs, else a 3-D set of
> data
>                  epochs (nchans,frames,epochs)
>         frames = frames per epoch {default|0 -> data length}
>         srate  = sampling rate per channel (Hz)
>
> And now I have a epoch from  Pz.  The name of the variable is 'a' . The fs
> of my experiment is 500 per second.  The size of variable 'a' is 1*600,
> which means the total time of a epoch is 1200ms.
> Now I want to plot the mean log spectrum of this epoch.    So I
> write spectopo(a, 600, 500) in the command line.
> Am I right?   I also want to know the algorithm of spectopo(). Is it
>  pwelch ?
>
> Yours,
>  Hui-bin Jia
>
>
>
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-- 
Stephen Politzer-Ahles
University of Kansas
Linguistics Department
http://www.linguistics.ku.edu/
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