[yt-users] How to take log of a user defined field ?

Aug. 18, 2015

      Hi,

I have a user defined field with the following definition.

def _epsilon(field, data):
    return (4.0/3.0)*(data['vShock']/data["VelocityMagnitude"])
add_field("epsilon", function=_epsilon, take_log=False, units=r" " )

Now I would like take ln(1 + data["epsilon"]). I am trying with the
following definition. Is this the correct way of doing this ?

def _lnepsilon(field, data):
    return 1 + data["epsilon"]
add_field("lnepsilon", function=_lnepsilon, *take_log=True*, units=r" " )

Thank you
-- 
Reju Sam John