sqrt() about dimensionful HOT 2 CLOSED

Hey Erik.

I tried to reproduce:

from dimensionful import *
from numpy import sqrt, pi

distance = Quantity(1.0, "AU")
mass_sun = Quantity(1.0, "Msun")
PP = 4 * pi**2 / G / mass_sun * distance**3
PP.convert_to_cgs()
sqrt(PP)

This throws AttributeError: sqrt. This is because numpy.sqrt is a ufunc, so it makes an array([PP], dtype=object), and tries to call PP.sqrt(). Quantities currently have no sqrt attribute, and this is the reason for the cryptic error.

This is definitely a design issue I came across and wasn't sure what to do about. I can't possibly cover every operation, but I think the best thing to do is to attach common operation methods to Quantity. Thoughts on this are very welcome.

For now, PP**(1.0/2) works and I will drop a sqrt method in soon.

from dimensionful.

Fixed in 8710910.

from dimensionful.