On Mon, Nov 3, 2014 at 5:29 PM, Suoqing JI <suoqing@physics.ucsb.edu> wrote:
Hi Stephanie,

Maybe you could specify a disk, use BinnedProfile1D to create bins along cylindrical radial ('cylindrical_r'), and do

profile.add_fields(‘cell_mass’, weight=None)

then you could plot profile[‘cell_mass’] vs. profile['cylindrical_r’] and get the 1-D plot the surface density.

This will be a profile of the gas mass as a function of radius, but it's not quite a surface density profile.  That said, for an unweighted projection, I think it's the same up to a constant scaling factor.
 

Best wishes,
--
Suoqing JI
Ph.D Student
Department of Physics
University of California, Santa Barbara
CA 93106, USA

On Nov 3, 2014, at 5:17 PM, Stephanie Tonnesen <stonnes@gmail.com> wrote:

Hi yt-users,

I would like to make a 1D plot of column density vs radius for a disk (to compare with observations).  I can make a projectionplot, but want something a bit more simple to look at.  I am using yt3.0.1--is there a nice way to to this?

The key is to use the numpy.digitize and numpy.bincount functions to find the histogram of the surface density as a function of radius.  Here's an example:

http://nbviewer.ipython.org/gist/ngoldbaum/af8e7f317efe8f115e8b
 
This is a simplified version of what I've done for a project I'm working on right now, which involves making a ton of radial plots of projected quantities:

https://bitbucket.org/ngoldbaum/galaxy_analysis/src/910f5a7e278247a36f25d62bdc478a7b5a7fe8ce/galanyl/galaxy_analyzer.py?at=default#cl-338

Thanks!

Stephanie

--
Dr. Stephanie Tonnesen
Alvin E. Nashman Postdoctoral Fellow
Carnegie Observatories, Pasadena, CA
stonnes@gmail.com
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