Order in which units are presented

Hi,

I have a quantity x that I would like to be presented in units of erg/(s Hz) or erg s^-1 Hz^-1, as opposed to erg/(Hz s) or erg Hz^-1 s^-1 because of how it looks when rendered in latex, among other reasons. I cannot seem to figure out a way to accomplish this – is this possible to do? And if so, how?

Another possible solution to my problem is getting the * or \times symbol to appear when the unit appears in LaTeX, i.e. erg/(Hz*s). Can that be done?

Thank you very much.

[smithis7]

I think this works albeit a little brute force:

>>> from astropy import units as u
>>> myunit = u.def_unit('myunit', u.Unit('erg/(s Hz)'), format={'generic': 'erg/(s Hz)'})  # add your own formatting
>>> x = 1 * myunit
>>> x
<Quantity 1. erg/(s Hz)>
>>> x.to(u.erg)
<Quantity 1. erg>

p.s. You can then register it into astropy.units with u.add_enabled_units([myunit]).

This is perfect – the place we are using this for is hidden pretty deep in our code, so this will do exactly what we need it to do (no need to make it look pretty). Thank you very much!

[pllim]

Glad to hear! 😸