Comment #3 on issue 1675 by and...@hotmail.com: Inconsistent behaviour of
atoms()
http://code.google.com/p/sympy/issues/detail?id=1675
Sorry - ignore my last post! Having read the docstring of the new patch, I
understand
a bit more....
1) Without the argument 'Function' in the call to atoms, f(x) is *not*
itself
considered an atom, so it is searched and the atom 'x' is found within it.
2) With the argument 'Function' in the call to to atom(...), f(x) *is*
recognised as
an atom, so in this case it is not subsequently searched for further atoms
that it
might contain.
Sorry for the muddle about this. I might propose a documentation patch to
clarify
this usage at some point.
BUT: If I have 'w = f(g(x))' and I want to find out all the functions used
in w, how
can I do this? I see that:
>>> f=Function('f')
>>> g=Function('g')
>>> w=f(g(x))
>>> w.atoms(Function)
set([f(g(x))])
In this example, I would like to identify that the functions f and g are
used in w,
but atoms does not help. Any suggestions how to do this?
Many thanks,
Andy
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