#2516: generalized hypergeometric functions should be implemented
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Reporter: ddrake | Owner: cwitty
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.2
Component: symbolics | Resolution:
Keywords: hypergeometric | Merged in:
Authors: Fredrik | Reviewers: Ralf Stephan
Johansson, Eviatar Bach, Ralf | Work issues:
Stephan | Commit:
Report Upstream: N/A | ebe4c6a12c88cf6fdf0e7eb7b43bcfe05dcab8a4
Branch: | Stopgaps:
u/rws/generalized_hypergeometric_functions_should_be_implemented|
Dependencies: |
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Comment (by nbruin):
OK, the problem is in `ext.fast_callable.function_name`, which gets called
by `sage.ext.fast_callable.ExpressionCall.__repr__`. with as argument the
"function" component of the ExpressionCall. The problem is: an expression
doesn't have a `__name__`. So you end up finding a `__name__` somewhere
higher in the inheritance. You just end up putting an extraneous attribute
on the expression. To illustrate the nasty side-effect:
{{{
sage: h = hypergeometric([],[],x)
sage: h.__name__
'CommutativeRings.element_class'
sage: from sage.ext.fast_callable import ExpressionTreeBuilder
sage: etb = ExpressionTreeBuilder(vars=['x'])
sage: _ = h._fast_callable_(etb)
sage: h.__name__
'hypergeometric((), (), x)'
}}}
As you see, `_fast_callable_` now has a side-effect on `h`!
A better solution would be to adapt the routine
`ext.fast_callable.function_name` (or the way it gets used). It's clear
you're now feeding it things it wasn't designed for.
--
Ticket URL: <http://trac.sagemath.org/ticket/2516#comment:40>
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