[SciPy-user] optimize.leastsq

David Trethewey dlrt2@ast.cam.ac...
Thu Jan 22 09:03:41 CST 2009

Managed to get this working with my data. Being able to do a 2-d fit 
with both metallicity and velocity information used is certainly 
interesting, although it doesn't seem to be too good at detecting 
subpopulations within my stellar stream which is what I'm trying to do.


David Cournapeau wrote:
> David Trethewey wrote:
>> How exactly would the EM algorithm be used? The homepage 
>> http://pypi.python.org/pypi/scikits.learn seems to be down at the moment.
> Hi David,
>     I have not updated the webpage, but the package has an example on
> how to use the BIC for comparing models:
> http://projects.scipy.org/scipy/scikits/browser/trunk/learn/scikits/learn/machine/em/examples/basic_example3.py
> Note that it uses artificial data, so the model is well specified. It
> does not work as well for real data :)
> cheers,
> David
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