Well, I think it can be useful, especially since the commutative
property is lost if you do
>>> s = Symbol(dummy.name, *dummy.assumptions0)
But of course, it should not go in if I am the only one who is going to
use it. I see your point about the need for a cleanup in the core :-P
Øyvind
ma., 05.04.2010 kl. 00.06 +0200, skrev Vinzent Steinberg:
> 2010/3/31 Øyvind Jensen <jensen.oyv...@gmail.com>:
> > In situations where it is natural to generate dummy symbols with
> > Symbol.as_dummy(), the reverse process may also be useful.
> >
> > Uncommented two tests for this.
> > ---
> > sympy/core/symbol.py | 11 +++++++++++
> > sympy/core/tests/test_symbol.py | 4 ++--
> > 2 files changed, 13 insertions(+), 2 deletions(-)
> >
> > diff --git a/sympy/core/symbol.py b/sympy/core/symbol.py
> > index e405fbb..641bba8 100644
> > --- a/sympy/core/symbol.py
> > +++ b/sympy/core/symbol.py
> > @@ -104,6 +104,17 @@ def __new__(cls, name, commutative=True,
> > **assumptions):
> > obj.dummy_index = Dummy.dummycount
> > return obj
> >
> > + def as_nondummy(self):
> > + """
> > + Returns the corresponding non-dummy symbol
> > +
> > + >>> from sympy import Symbol
> > + >>> x1 = Symbol('x', dummy = True)
> > + >>> x1.as_nondummy() == Symbol('x')
> > + True
> > + """
> > + return Symbol(self.name, self.is_commutative, **self.assumptions0)
> > +
> > def _hashable_content(self):
> > return Symbol._hashable_content(self) + (self.dummy_index,)
> >
> > diff --git a/sympy/core/tests/test_symbol.py
> > b/sympy/core/tests/test_symbol.py
> > index 5fb82ff..f0e8b6e 100644
> > --- a/sympy/core/tests/test_symbol.py
> > +++ b/sympy/core/tests/test_symbol.py
> > @@ -23,13 +23,13 @@ def test_as_dummy_nondummy():
> > x1 = x.as_dummy()
> > assert x1 != x
> > assert x1 != x.as_dummy()
> > - # assert x == x1.as_nondummy()
> > + assert x == x1.as_nondummy()
> >
> > x = Symbol('x', commutative = False)
> > x1 = x.as_dummy()
> > assert x1 != x
> > assert x1.is_commutative == False
> > - # assert x == x1.as_nondummy()
> > + assert x == x1.as_nondummy()
> >
> > def test_lt_gt():
> > x, y = Symbol('x'), Symbol('y')
> > --
> > 1.6.5
>
> I don't think this is useful, so I would rather not add it, but I
> don't mind much.
>
> Vinzent
>
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