[yt-users] how to add halo quantity

[Daegene Koh]

Hi all,

I’m trying to add a new quantity to a halo catalog following the docs as such, 

 23 def _total_mass(halo):
 24     gasmass, dmmass =  halo.data_object.quantities.total_mass()
 25     return gasmass+dmmass
 26     
 27 add_quantity('total_mass',_total_mass)
 28 hc.add_quantity('total_mass’)

however, it seems at add_quantity is not defined. How do I go about doing this?

Cheers,
DK

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