Thanks!
On Wednesday, April 13, 2016 at 7:08:37 PM UTC+2, Aaron Meurer wrote:
>
> sympy.Function is absolutely designed to be subclassed.
>
> If f = Function('f'), then f is a subclass of UndefinedFunction, and
> f(x) is an instance of AppliedUndef (both can be imported from
> sympy.core.function). You can find custom functions with
> y.atoms(AppliedUndef).
>
> Aaron Meurer
>
>
> On Wed, Apr 13, 2016 at 8:35 AM, Nico <[email protected] <javascript:>>
> wrote:
> > To get all function from an expression, one can do
> > ```
> > from sympy import *
> >
> > f = Function('f')
> > x = Symbol('x')
> > y = f(x) + 2 * sin(x)
> >
> > for fun in y.atoms(Function):
> > print(fun.func)
> > ```
> > which in this case will print out `f` and `sin`.
> >
> > I would now like to distinguish between function that I defined myself
> (`f`)
> > the ones that come from elsewhere. I though about subclassing
> > `sympy.Function`, but apparently it's not exactly meant to be used that
> way
> > [1].
> >
> > Any hints?
> >
> > Cheers,
> > Nico
> >
> >
> > [1] https://groups.google.com/forum/#!topic/sympy/pU81Trc_Xr8
> >
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