[yt-users] Problem using covering_grid as data_source for the photon_simulator

[Nathan Goldbaum]

On Friday, May 27, 2016, Markus Haider <markus.haider at uibk.ac.at> wrote:

> Hi John,
>
> Thanks for hinting me to ds.ortho_ray. This is what I meant :-)
>
> Btw, For a different anaylsis I would need to understand how the yt.box
> command works. Does it contain all the cells which have their center
> between the left and right boundaries or only cells which have both their
> center and edges between the specified left and right boundaries?
>

It will contain all the cells that have centers between the left and right
edge.


>
>
>
> Cheers,
> Markus
>
>
> On 2016-05-25 18:44, John Zuhone wrote:
>
> Hi Markus,
>
> ds.ortho_ray should work?
>
>
> http://yt-project.org/docs/dev/reference/api/generated/yt.data_objects.selection_data_containers.YTOrthoRay.html#yt.data_objects.selection_data_containers.YTOrthoRay
>
> But as a warning see:
>
>
> http://yt-project.org/docs/dev/faq/index.html#why-are-the-values-in-my-ray-object-out-of-order
>
> but that shouldn’t matter for photon_simulator, I don’t think.
>
> BTW, since you use this module a lot, I should probably point out here
> that there will be no further development of photon_simulator in yt as it
> is now being transitioned into a new package, pyXSIM:
>
> http://bitbucket.org/jzuhone/pyxsim
>
> which is stable now but doesn’t have adequate documentation for me to have
> an official release. It will be the same software as the yt version with
> some minor adjustments. If you want to try it, mail me off-list and I can
> tell you how to install it and how to re-write your script to work with it.
>
> The version currently in yt will stay there for the time being, so no need
> to worry, but I will not be updating it unless there are bug reports.
>
> Best,
>
> John
>
> On May 25, 2016, at 12:39 PM, Markus Haider <markus.haider at uibk.ac.at
> <javascript:_e(%7B%7D,'cvml','markus.haider at uibk.ac.at');>> wrote:
>
> Hi John,
>
> Thanks for your fast reply. So generally we are trying to make a mock
> spectrum of a galaxy cluster around the iron line. I enclosed the script I
> use, but maybe it is not of a big help as I just started doing this. You
> are probably right that I should youse ds.region. What I wanted to do is
> selecting a line of sight which is only one cell wide (native resolution of
> the simulation) but e.g. 1 Mpc deep.
>
> Cheers,
> Markus
>
> On 2016-05-25 18:28, John Zuhone wrote:
>
> Hi Markus,
>
> Can you send a script so I can figure out what you are trying to do
> exactly?
>
> You probably need ds.region, but if you send a script I will know for sure.
>
> John Z
>
> Sent from my iPod
>
> On May 25, 2016, at 12:23 PM, Markus Haider <markus.haider at uibk.ac.at
> <javascript:_e(%7B%7D,'cvml','markus.haider at uibk.ac.at');>> wrote:
>
> Hi,
>
> I wanted to use the photon simulator for mock x-ray observations on single
> cells and line of sights using single cells. For this I wanted to select
> the cells using covering_grid, but then I get the following error:
>
> photon_simulator.py is doing
> delta_min, delta_max = data_source.quantities.extrema("d%s"%ax)
> and the result is
> YTDataSelectorNotImplemented: Data selector 'covering_grid' not
> implemented.
>
> But maybe covering_grid is not the right thing for what I had in mind, how
> would you select the cells to pass as data_source to the photon simulator?
>
> Cheers,
> Markus
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> <create_mc_photons_region.py>
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