#17678: special values of Bessel functions
-------------------------------------+-------------------------------------
Reporter: rws | Owner:
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-6.5
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: Ralf Stephan | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/rws/special_values_of_bessel_functions|
191ca289d3c26813e0244251a983a62f2057347a
Dependencies: | Stopgaps:
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Comment (by kcrisman):
I like the general idea of this ticket! What happens in the following
scenario
{{{
+ if x == 0:
+ if n == 0:
+ return ZZ(1)
}}}
for
{{{
sage: bessel_J(0.0, 0.0)
1
}}}
should it instead return `1.0`? I feel like we have a lot of code in Sage
doing type conversions of this kind smartly - sadly, I was not the one
gifted to write it. Maybe something like saving the parents of the input
and if one is inexact then so is the output, something along those
lines... we had some issues with `sin(0)` versus `sin(0.0)` even, I think;
currently
{{{
sage: sin(0)
0
sage: sin(0.0)
0.000000000000000
sage: sin(float(0))
0.0
sage: sin(RDF(0))
0.0
sage: sin(complex(0))
0j
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/17678#comment:3>
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