Thank you Britton, it resolves the conflict. Junhwan

On Tue, Jan 8, 2013 at 1:01 PM, Britton Smith brittonsmith@gmail.comwrote:

Hi Jun-Hwan,

I'm mostly guessing here, but when you profile a field, it defaults to doing a mass-weighted profile, such that the value for any bin in the profile is: Sum (field * mass) / Sum (mass). If your object is a very flat disk, then there is probably not much mass outside the plane of the disk, so even when you do a spherical profile, the cells in the disk are dominating the average. My guess is that if you switch to doing a volume-weighted profile of the density, you will get answers that differ more. You can do that in the add_field call by adding weight_field="CellVolume".

Britton

On Tue, Jan 8, 2013 at 12:50 PM, Jun-Hwan Choi jhchoi@pa.uky.edu wrote:

...

Hi all,

I have a gas disk simulation and try to compute gas density profile. I generate to make spherical average density profile by feeding a sphere object to the BinnedProfile1D and cylindrical average density profile by feeding a disk object to the BinnedProfile1D. Surprisingly, both density profile is almost the same. Does any one have idea why? FYI, I past my yt script at http://paste.yt-project.org/**show/3046/http://paste.yt-project.org/show/3046/.

Thank you in advance. Junhwan

-- ------------------------------**------------------------------**-- Jun-Hwan Choi, Ph.D. Department of Physics and Astronomy, University of Kentucky Tel: (859) 897-6737 Fax: (859) 323-2846 Email: jhchoi@pa.uky.edu URL: http://www.pa.uky.edu/~jhchoi ------------------------------**------------------------------**--

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