On 07.04.2014 21:35, Björn Dahlgren wrote:
On Monday, 7 April 2014 19:25:59 UTC+2, Björn Dahlgren wrote:
h is Symbol('h') (and given how sympy cache works - yes it is global).
I was unsure whether I should use this or force the user to pass at least
one parameter.
Maybe I should let it default to 1 instead of Symbol('h')? I'm starting to
lean towards that
the more I think of it..
On Monday, 7 April 2014 19:04:38 UTC+2, [email protected] wrote:
On 07.04.2014 19:34, Björn Dahlgren wrote:
After reading Aaron's recommendation about looking for unanswered sympy
questions at stackoverflow I stumbled upon:
http://stackoverflow.com/questions/18701290/derivatives-discretization-with-sympy
I implemented a solution for this and it is available as a WIP PR over
here:
https://github.com/sympy/sympy/pull/7382
I would love to hear your feedback on this.
Hi,
From the stackoverflow question here is your example:
> Here is an example:
>>> from sympy import symbols, Function
>>> x, h = symbols('x h')
>>> f = Function('f')
>>> print(f(x).diff(x).as_finite_diff())
-f(-h + x)/(2*h) + f(h + x)/(2*h)
Is it means that you use "h" symbol from the global namespace?
Giving this another minute of thought you are right that this is no good. I
added a new commit and updated my answer at Stack Overflow.
Thank you for your input!
Thank you.
--
Alexey Gudchenko
--
Alexey Gudchenko
Best regards
/Björn
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