[AstroPy] Help needed - Pix2Sky error

[Nadezhda Dencheva]

Hi Christian,

It' s best to import models like this:

>>> from astropy.modeling import  models
>>> ait = models.Pix2Sky_AIT()
>>> ait(1, 2)
(1.0004603647362484, 2.000082499873663)
>>> ait.inverse(1.0004603647362484, 2.000082499873663)
(1.0, 2.0000000000000004)

Nadia

________________________________
From: astropy-bounces at scipy.org [astropy-bounces at scipy.org] on behalf of Christian Johnson [arcjohns at ucsc.edu]
Sent: Thursday, September 10, 2015 2:05 PM
To: astropy at scipy.org
Subject: [AstroPy] Help needed - Pix2Sky error

Hi all,

(if this is the wrong list to use for questions like this, please let me know!)

I'm attempting to use astropy to get data out of a FITS file in the Aitoff projection, and was trying to use the astropy.modeling.projections.Pix2Sky_AIT class (that I found here: http://astropy.readthedocs.org/en/latest/modeling/index.html). However, when I try to use it, I get an error that there is no module of that name ("AttributeError: 'module' object has no attribute 'Pix2Sky_AIT'"). I can successfully import astropy.modeling.projections.Projection or astropy.modeling.projections.Zenithal or a few others, but most throw this error.

Is there something I'm doing wrong, or does some other package need to be installed for these modules to work correctly?

Thanks in advance,
Christian Johnson
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