[AstroPy] ESA Summer of Code in Space 2013

[Erik Tollerud]

I want to issue a generic plea on this issue: lets do our best to join
forces.  There are already a number of tools that do part of spectrum
plotting and line-fitting, and if we'd all work together, with less
effort we'd have a tool that does all of those and more.   That's the
main point of Astropy, after all: encouraging collobaration on and
re-use of python tools for astronomy.  I'm partly guilty here, as I
have a similar fitting tool in astropysics -
http://pythonhosted.org/Astropysics/gui/spylot.html, but I'd rather
encourage people to use a tool that we can all get behind. I'll  call
this the "Astropy spirit" :)

That said, I see the virtue of designing a new tool (ideally an
astropy affiliated package) to combine the shared wisdom (perhaps with
SOCIS, if it goes through). But the *worst* thing to have happen is to
have the other efforts continue in parallel, with everyone designing
similar but slightly incompatible tools.

Along similar lines, Emil and Adam (although I think Adam already
knows about it), I'd *strongly* encourage you to take a look at the
astropy modeling framework
(http://docs.astropy.org/en/latest/modeling/index.html) - this will be
in the next major release, and I'd hate to see you re-implementing all
of that in an incompatible way. Or, if you don't like something about
how that works for your needs, please help us make it better!


On Thu, Jun 20, 2013 at 8:42 AM, Slavin, Jonathan
<jslavin at cfa.harvard.edu> wrote:
> Hi Adam,
>
> I have used pyspeckit.  There are parts of it that are very useful, but I
> found overall that it didn't do what I wanted.  For example, I wanted to
> give it my spectrum, have it display it, allow me to manually (in the gui)
> place my guesses for line centers (would probably need guesses for widths as
> well) and then fit the lines (and continuum) and return the fitted line
> centers, widths, and amplitudes, etc. along with error estimates.  It's been
> a while now since I used it, but as I recall, pyspeckit did not do all of
> those things.  There may have been other reasons as well, but in the end I
> wrote my own fitting routines to work with the data.  Am I wrong about the
> capabilities of pyspeckit?
>
> Jon
> ________________________________________________________
> Jonathan D. Slavin                 Harvard-Smithsonian CfA
> jslavin at cfa.harvard.edu       60 Garden Street, MS 83
> phone: (617) 496-7981       Cambridge, MA 02138-1516
> fax: (617) 496-7577            USA
> ________________________________________________________
>
>
>
> On Wed, Jun 19, 2013 at 5:21 PM, <astropy-request at scipy.org> wrote:
>>
>> Date: Wed, 19 Jun 2013 13:32:31 -0700 (PDT)
>> From: Adam Ginsburg <keflavich at gmail.com>
>> Subject: Re: [AstroPy] ESA Summer of Code in Space 2013
>> To: astropy-dev at googlegroups.com
>> Cc: astropy at scipy.org
>> Message-ID: <44536fa7-b34e-4f05-941b-2cc05535bcc5 at googlegroups.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>>
>> Emil and Jon - there is a package that fits exactly those requirements,
>> called pyspeckit:
>> pyspeckit.bitbucket.org
>>
>> One of my major goals over the next year is to incorporate it into astropy
>> bit by bit, i.e. make it work with astropy.models, astropy.units, and
>> specutils.  Only a little progress in that direction has been made (in
>> part
>> because my coding efforts have been focused more on astroquery).
>>
>> Emil - there is a scipy-dependent voigt profile implemented in pyspeckit.
>>  You can check that it agrees with yours:
>>
>> http://pyspeckit.bitbucket.org/html/sphinx/models.html#pyspeckit.spectrum.models.inherited_voigtfitter.voigt
>>
>> I'm bringing this up on this particular thread because I had considered
>> submitting pyspeckit as a SOCIS project, but I think focusing on specutils
>> instead will be better for the community.  Nonetheless, there are some
>> specific project ideas in place that may help support the case for a
>> student working on specutils via SOCIS:
>> pyspeckit.bitbucket.org/html/sphinx/projects.html
>>
>
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-- 
Erik