[yt-users] DM particles or baryon density field ?

Agarwal, Shankar sagarwal at ku.edu
Mon Mar 22 09:57:33 PDT 2010


Yes, "Dark_Matter_Density field projections and slices" is what I meant. I will try replacing "Density" with "Dark_Matter_Density".


Also, let me know if I am right...

p = pc.add_projection("Density", 0)    ------- This is baryon density field.

p.modify["nparticles"](1.0)            ------- But this is DM particles (since there is no baryon particles dataset ?).


Shankar




-----Original Message-----
From: yt-users-bounces at lists.spacepope.org on behalf of Matthew Turk
Sent: Mon 3/22/2010 11:32 AM
To: Discussion of the yt analysis package
Subject: Re: [yt-users] DM particles or baryon density field ?
 
Hi Shankar,

I guess the question is sort of ill-defined.  Dark matter is
discretized as particles; the idea of projecting dark matter is not
the same as projecting a field quantity.  The same goes for plotting
slices.

However, you can make dark matter plots.  You cna use the
"add_particles" method on the PlotCollection, which accepts an axis
and a width -- what it does is plot all the particles within that
rectangular prism.  This can be mocked up as a projection by setting
the width equal to the domain width along that axis.

You can also try using "Dark_Matter_Density", which might be easier to
visualize, as a projection or a slice.

If you run into any problems with the particle plot, let us know --
it's not as well-used as the other plots, so there might be subtle
bugs.  :)

-Matt

On Mon, Mar 22, 2010 at 9:27 AM, Agarwal, Shankar <sagarwal at ku.edu> wrote:
> Hi,
>
> The projection, slice, velocity and overplot particles routines: They read the DM particles or gas ?
>
> Looking at the density legend, it looks like this is baryon density field.
>
> Is there a provision to plot projection and slice for DM ?
>
>
> Also, I get this error when overplotting particles...
>
> yt         INFO       2010-03-22 12:17:44,051 Created plot collection with default plot-center = [0.5, 0.5, 0.5]
> yt         INFO       2010-03-22 12:17:44,144 Getting the binary hierarchy
> yt         INFO       2010-03-22 12:17:44,153 Finished with binary hierarchy reading
> yt         INFO       2010-03-22 12:17:46,108 Added slice of Density at x = 0.5 with 'center' = [0.5, 0.5, 0.5]
> Traceback (most recent call last):
>  File "slice.py", line 42, in <module>
>    p.modify["nparticles"](0.005)
>  File "/autohome/u118/agarwa23/yt-x86_64/src/yt-1.6/yt/raven/PlotTypes.py", line 52, in __getitem__
>    raise KeyError(item)
> KeyError: 'nparticles'
>
>
>
> Shankar
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> yt-users at lists.spacepope.org
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