Hi
smichr wrote:
> One more thing. If you are working with noncommutatives, it would be
> great to have you testing 1766. There is awareness there that isn't in
> master yet:
>
>>>> c, d=symbols('cd', commutative=0)
>>>> (d**3).coeff(d**2)
> 0
>>>> (d**3).coeff(d**2, exact=0)
> d
>>>> a=d**2*c*d
>>>> a.extract_multiplicatively(d**3)
>>>> a.extract_multiplicatively(d**2)
> c*d
Thanks for the hints. The iterative list comprehension and
extract_multiplicatively are the things that I was looking for. Great.
>>>> a.extract_multiplicatively(d)
> d**2*c
>>>> a.coeff(c)
>>>>
>
> That last one results because you can't pull out everything and have
> only c on the right.
on my machine (with the your 1766 branch) I get
In [29]: c, d = symbols('c d', commutative = False)
In [30]: a = d**2 * c *d
In [31]: a.coeff(c)
Out[31]: d**2
You get None if I understand correctly. Can that be true? (And I
unfortunately dont understand your explanation.)
> It's not been tested other than by the few
> doctests that I have, so you are likely to run into something...but
> you are already running into problems and might get further in 1766
> and help get it into shape at the same time.
Actually my question resulted from just a short trip to the
non-commutative world (an exercise from a course on functional
analysis). I dont know if I need more non-commutative calculations.
Regards,
Bastian.
PS (OT): Is there a proper way to have several sympy branches installed
in PYTHONPATH?
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