This appears to be related to known issues. Please your add observations
to the bug report so that those working on the units package may have as
much information as possible.
See: https://github.com/sympy/sympy/issues/18368
A work around that involves more work on your part, but does not behave
oddly is to define unit symbols as positive and real SymPy variables
(e.g. `var('J kg m s', positive=True, real=True)`). They will behave as
you expect. You can convert units by using syntax such as
`.subs({J:kg*m**2/s**2})`, which would convert J to the SI base units.
Jonathan
On 10/26/20 5:39 PM, [email protected] wrote:
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I have noticed in the unit systems module I get odd behavior trying to
convert to a unit that does not match the expression. For example
after importing
>>> from sympy.physics.units import *
and executing
>>> convert_to(5*V, ohm)
I get
5*10**(1/3)*ohm**(8/9)
but other times it behaves as I would expect, such as
>>> convert_to(5*joule, m)
5*joule
Any ideas why this is occurring?
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