Status: Accepted
Owner: [email protected]
Labels: Type-Defect Priority-Medium Milestone-Release0.7.0
New issue 2205 by [email protected]: "Undefined functions"
http://code.google.com/p/sympy/issues/detail?id=2205
There's already a pull request under way that gives "undefined functions"
(i.e. the objects returned from Function("f") and the like) their own
class, called "UndefinedFunction" for now, cf.
https://github.com/sympy/sympy/pull/102 but there are a few more simple
improvements to consider:
* The name is rather silly. These objects could be called just "Functions"
but the name is already taken to designate something that isn't a function.
* Identifying "undefined functions" was only possible by setting
an 'undefinedFunction' attribute and checking for its presence. This should
be replaced with isinstance().
* The constructor takes a 'signature' argument that seems unused. Can it be
removed safely?
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