#16697: implement symbolic lower incomplete gamma function
-------------------------------------+-------------------------------------
Reporter: rws | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-pending
Component: symbolics | Resolution:
Keywords: gamma, | Merged in:
incomplete, special, functions | Reviewers: Buck Evan
Authors: Ralf Stephan | Work issues:
Report Upstream: N/A | Commit:
Branch: u/rws/16697-1 | f3be6f16908734f6c6e752578653a3ca09189011
Dependencies: sympy-0.7.7 | Stopgaps:
-------------------------------------+-------------------------------------
Comment (by buck):
There's doctest coverage missing (for the deprecated function), and this
patch doesn't fix the numerical instability in incomplete gamma as
promised [ticket:18210#comment:18 elsewhere].
{{{
sage: gamma_inc_lower(25, 14.5).n()
-6.63538851954338e22
sage: gamma_inc_lower(25, 14.5).n(algorithm='mpmath')
-6.63538851954338e22
sage: gamma_inc_lower(25, 14.5).n(algorithm='pari')
-6.63538851954338e22
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/16697#comment:60>
Sage <http://www.sagemath.org>
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