[yt-users] velocity annotation dark matter

[Long Do Cao]

Hi Nathan,

Thanks for your email. Indeed, I just had to change the field name and function to :

 slc.annotate_quiver(("deposit","all_cic_velocity_x"),("deposit","all_cic_velocity_y"),factor=16)

and that solved my problem. You can close the ticket.

Thanks again,

Long

On 17 janv. 2015, at 10:04, Nathan Goldbaum wrote:

> 
> 
> On Wed, Jan 14, 2015 at 6:39 PM, Long Do Cao <docao at vega.ess.sci.osaka-u.ac.jp> wrote:
> Hi all yt-users,
> 
> I'm running into a simple problem I think, but can't find the correct documentation. 
> 
> I want to make a slice plot of dark matter density with velocity vectors overlaid, using Gadget HDF5 data. I have uploaded my script here :
> 
> http://paste.yt-project.org/show/5347/
> 
> Hi Long,
> 
> This is a bit confusing in our API, and we should probably make an effort to improve our naming here, but the velocity callback ('annotate_velocity') is really the *gas* velocity callback.  It's not working in your case because you do not have any gas in your simulation.
> 
> Instead, you should call the quiver callback ('annotate_quiver'), and specify the deposited dark matter velocity fields as your field_x and field_y:
> 
> http://yt-project.org/docs/dev/reference/api/generated/yt.visualization.plot_modifications.QuiverCallback.html?highlight=quivercallback
> 
> Hope that helps, please let us know if you have any additional questions.
> 
> -Nathan
>  
> 
> The slice plot works fine. However, I got an error message for the velocity overlay:
> 
> http://paste.yt-project.org/show/5349/
> 
> The bottom line is the following :
> YTFieldNotFound: Could not find field '('all', 'velocity_x')' in snapshot_000.
> 
> The error is pretty obvious, I think YT is looking for the default field, whereas it should look for a deposit of the dark matter data. Somehow I should specify that yt should look for this deposit, but I don't know how ?
> 
> Thank you by advance for your help,
> 
> Long
> 
> --------------------------------------------------------------
> Long DO CAO (Office F617)
> Office phone: +81 6-6850-5482
> Osaka University, Graduate School of Science
> Department of Earth and Space Science
> 1-1 Machikaneyama-cho
> Toyonaka, Osaka, 560-0043, Japan
> ---------------------------------------------------------------
> 
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--------------------------------------------------------------
Long DO CAO (Office F617)
Office phone: +81 6-6850-5482
Osaka University, Graduate School of Science
Department of Earth and Space Science
1-1 Machikaneyama-cho
Toyonaka, Osaka, 560-0043, Japan
---------------------------------------------------------------

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