#12303: leave beta symbolic for exact complex inputs
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Reporter: ktkohl | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-5.0
Component: symbolics | Resolution:
Keywords: special function | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: 9130 | Stopgaps:
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Comment (by benjaminfjones):
How is a Ginac function called to do numerical evaluation? I thought this
would work as a custom `_eval_` method for `beta`:
{{{
#!python
def _eval_(self, y, z):
if not isinstance(y, Expression) and not isinstance(z, Expression)
and \
(is_inexact(y) or is_inexact(z)):
coercion_model = sage.structure.element.get_coercion_model()
y, z = coercion_model.canonical_coercion(y, z)
return GinacFunction.__call__(self, y, z)
return None
}}}
But `GinacFunction.__call__` ends up calling the custom `_eval_` and I get
an infinite recursion. I'm having trouble using the debugger to determine
how, for example, `beta(4.0, 5.0)` is calculated. Is this because Pynac is
mostly in Cython?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12303#comment:2>
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