[yt-users] yt help deriving new fields

[tazkera haque]

Hi, I need a little help in defining a new derived field. my goal is to
find if a stellar system eject some mass or not.

I am attaching the derived_field_list from the file I have. I am trying to
define the total energy of the system E=0.5*m*v**2+gravitational potential
energy*m

I am completely new to python and trying to get hold of the language
through yt. I am attaching my efforts and the errors. please help me fix
that.

Thanks in advance.

Tazkera
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