[yt-users] Dark Sky Simulations, analysis gone wrong.

[ALEXANDROS TSOUROS]

Hello all!

I am quite new to yt, so please bear with my ignorance!

I need to perform analysis on the open data of the Dark Sky Simulation 
(http://darksky.slac.stanford.edu). In particular I need to create 1 
dimensional profiles of the radial velocity of dark matter particles 
around halos.

Attached, you'll find my attempt at producing such a profile.

When I do this on a GADGET2 simulation I've run, I can use the 
'radial_velocity' field without a problem. However, this script, where 
the data is that of the Dark Sky simulation, produces the following 
output :

'
(...)
yt.utilities.exceptions.YTFieldNotFound: Could not find field '('all', 
'radial_velocity')' in ds14_a_1.0000.'


However, as I understand it, the field 'radial_velocity' is native to 
yt. How can I surpass this problem?

Any help will be appreciated.

Thank you very much for your time,
Tsouros Alexandros
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