That one looks like a bug. sympify(ReferenceFrame('o').x) does not work.
This really shows why it is important for all SymPy objects to follow the
basic args invariants. ReferenceFrame('o') has no .args, and
ReferenceFrame('o').x.args is a list (!) containing a tuple of a matrix and
a ReferenceFrame.
Aaron Meurer
On Tue, Apr 8, 2014 at 2:37 AM, Dirk Fortmeier <[email protected]>wrote:
> Here's another one:
> http://stackoverflow.com/questions/22930329/how-to-implement-div-and-grad-in-sympy:)
>
> SO is really helpful indeed for question that do not rely on much
> discussion. Which is the problem with my current question ... I think there
> are a lot of side questions to it, so I think I will post here as well.
>
> Btw: Hello sympy community!
>
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