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]> 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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