[Pkg-exppsy-maintainers] Was: ridge... now VALGRIND time
Per B. Sederberg
persed at princeton.edu
Tue Jan 15 23:23:38 UTC 2008
On Jan 15, 2008 6:18 PM, Yaroslav Halchenko <debian at onerussian.com> wrote:
> > Typically we collect continuous data for about 1 hour at around 500Hz.
> > That gives us 1.8 million samples per channel with up to around 128
> > channels. Definitely doable.
> if my calculations correct it would be
> *octave:2> (1.8*10^6*128*8)/1024^3
> ans = 1.7166
> 1.7GB of data... not too bad... should be managable to work on in memory
Indeed, but as soon as you calculate phase and power for all of those
samples, it becomes much much bigger.
> > However, I think one very viable option is to store EEG in the NetCDF
> > data format, which has some good python wrappers that allow you to
> > access the dataset as a numpy array, but not load the entire thing
> > into memory. There are even wrappers for matlab (if people would like
> > to do such a thing.)
> That sounds great! Someone should write NetCDFDataset! We should add
> that to TODO ;-) Shouldn't be too difficult I think...
> > The only problem is that the latest NetCDF is not at a stable release
> > the last time I checked. Still possibly usable, but a moving target.
> Is API changing wildly?
On closer look, the person writing the best wrapper recently released
a version that also supports the stable version of NetCDF and does it
far better than the current Scientific python version:
It's only dependencies are already in debian testing, so it shouldn't
be crazy to make a debian package for it. I'm still a novice with
this packaging business, but I could give it a whirl. It does
certainly fall under the realm of what pkg-exppsy is trying to do :)
> Yaroslav Halchenko
> Research Assistant, Psychology Department, Rutgers-Newark
> Student Ph.D. @ CS Dept. NJIT
> Office: (973) 353-5440x263 | FWD: 82823 | Fax: (973) 353-1171
> 101 Warren Str, Smith Hall, Rm 4-105, Newark NJ 07102
> WWW: http://www.linkedin.com/in/yarik
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