#2516: generalized hypergeometric functions should be implemented
-------------------------------------+-------------------------------------
Reporter: ddrake | Owner: cwitty
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.3
Component: symbolics | Resolution:
Keywords: hypergeometric, | Merged in:
special | Reviewers: Ralf Stephan, Nils
Authors: Fredrik | Bruin
Johansson, Eviatar Bach, Ralf | Work issues:
Stephan | Commit:
Report Upstream: N/A | d36389d37cefe44cf9e5e957f5ed1829645463fb
Branch: u/rws/ticket/2516 | Stopgaps:
Dependencies: |
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Comment (by nbruin):
I noticed this:
{{{
+lazy_import("sage.functions.hypergeometric", "hypergeometric")
...
special_sage_to_max={
+ hypergeometric : lambda A, B, X : [[mqapply],[[max_hyper,
max_array],lisp_length(A.cdr()),lisp_length(B.cdr())],A,B,X]
}
}}}
This can't do what I think it is meant to do. Either the reference to
"hypergeometric" as a dictionary key leads to resolving the lazy import
(this is the most likely, because we'll need `hypergeometric.__hash__()`
to set the dict entry), in which case there's no point in doing a lazy
import, or some lazy proxy makes it into the dictionary as a key, which is
then out of reach of the lazy import resolver to substitute with the real
thing, leaving the proxy (and its slowdown) in place indefinitely.
I suspect that just importing `hypergeometric` normally will lead to
acceptable performance.
--
Ticket URL: <http://trac.sagemath.org/ticket/2516#comment:66>
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