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?
>
>
>
>
> --
> Alexey Gudchenko
>
>
> > Best regards
> > /Björn
> >
>
>
>
>
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