Re: [matplotlib-devel] GNU/Hurd support

[Benjamin Drung]

Am Samstag, den 06.02.2010, 14:02 -1000 schrieb Eric Firing:
> Benjamin Drung wrote:
> > Hi,
> > 
> > we applied 40_hurd.patch for building matplotlib on Debian GNU/Hurd.
> > 
> > Additional attached the 10_build_fix.patch. This patch does two things.
> > First it enables matplotlib on all Debian architectures. The second
> > things is that it removes /usr/local from the basedir.
> > 
> > It would be nice if you can provide a configure flag for disabling
> > the /usr/local directory from the basedir. Then we can drop this patch.
> > 
> 
> Sorry, I dropped this the last time you brought it up.  I have now added 
> gnu0 as a platform, and added a "basedirlist" option to setup.cfg.  See 
> svn r8113 and 8115.

Thanks.

-- 
Benjamin Drung
Ubuntu Developer (www.ubuntu.com) | Debian Maintainer (www.debian.org)


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Re: [matplotlib-devel] Comparison of mlab.csd and Matlab's cpsd

[Ariel Rokem]

Hi Ludwig (responding also to list),

I don't think that the cause of the discrepancy is because of the
hamming/hanning window difference. I do set the window in the matlab part to
also be a hanning window of length nfft.

Cheers,

Ariel


On Sun, Feb 7, 2010 at 7:45 AM, Ludwig Schwardt
wrote:

> Hi,
>
> On Sun, Feb 7, 2010 at 12:46 AM, Ariel Rokem  wrote:
> > I don't think that a major reworking of the logic of the function is
> needed.
> > Simply replacing the line you mentioned with:
> >
> > Pxy *= 1 / (np.abs(windowVals)**2).sum()
> > Pxy[1:-1] *= scaling_factor
> > if scale_by_freq:
> > Pxy[[0,-1]] /= Fs
>
> I agree. I was hoping the first two lines above would be sufficient.
> Then I saw scaling_factor also included Fs if scaling by frequency,
> and Pxy is of shape (numFreqs,n), i.e. not a straightforward 1-D
> array, which caused me to reserve my judgment a little bit... :-)
>
> > What does become more apparent when I do that is that in frequency bands
> in
> > which the power is rather small, the ratio discrepancies between the mlab
> > result and the matlab result can be rather large, on the order of a
> factor
> > of 2-2.5, even when the differences are tiny. Similarly, when the power
> is
> > rather large, there can be non-negligible differences between the two
> > results. Is there anything to do about that?
>
> Could this be because Matlab uses a Hamming window by default, while
> mlab uses a *Hanning* window by default? Very similar-sounding names,
> and also very similar windows numerically (but not exactly the
> same)...
>
> Ludwig
>



-- 
Ariel Rokem
Helen Wills Neuroscience Institute
University of California, Berkeley
http://argentum.ucbso.berkeley.edu/ariel
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