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

Matthew Turk matthewturk at gmail.com
Mon Mar 22 09:58:17 PDT 2010


Yup, you're right.

On Mon, Mar 22, 2010 at 9:57 AM, Agarwal, Shankar <sagarwal at ku.edu> wrote:
> 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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>>
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