#9634: binomial does not accept variable when only in the lower argument
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Reporter: Henryk.Trappmann | Owner: burcin
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.7
Component: symbolics | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author: Burcin Erocal
Merged: | Dependencies:
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Comment(by kcrisman):
Replying to [comment:2 burcin]:
> attachment:trac_9634-symbolic_binomial.patch replaces the top level
`binomial()` function with the one defined in `sage.functions.other`. This
version can handle symbolic input, as opposed to the previous one from
`sage.rings.arith`.
>
Good catch; I was pretty sure we had rewritten that at some point, but I
have trouble following the imports.
> This still needs work, since the files `sage/functions/other.py` and
`sage/rings/arith.py` don't pass doctests yet.
> We need to improve the speed of numerical approximation using the
`gamma` trick from `sage.rings.arith.binomial` and change
`sage.symbolic.pynac.py_binomial()` to handle large integers.
Is that part of this ticket? Are you saying that the numerical
approximation has slowed down dramatically from the `rings.arith` version?
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9634#comment:4>
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