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

Yup, you're right. On Mon, Mar 22, 2010 at 9:57 AM, Agarwal, Shankar 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@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 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'

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