I also put these patches on github/fix_dummy
cheers!
Øyvind
On 31 Mar, 12:56, Øyvind Jensen <jensen.oyv...@gmail.com> wrote:
> 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
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