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
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...
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 ---------------------------------------------------------------