#9634: binomial does not accept variable when only in the lower argument
------------------------------------+---------------------------------------
Reporter: Henryk.Trappmann | Owner: burcin
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.11
Component: symbolics | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Burcin Erocal | Merged in:
Dependencies: | Stopgaps:
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Changes (by burcin):
* status: needs_work => needs_review
Old description:
> {{{
> sage: var('k')
> k
> sage: binomial(x,3)
> 1/6*(x - 2)*(x - 1)*x
> sage: binomial(3,k)
> ---------------------------------------------------------------------------
> TypeError: Either m or x-m must be an integer
> }}}
>
> From kcrisman:
> Is this a bug? I would say yes, because
> {{{
> sage: binomial(x,k)
> binomial(x, k)
> }}}
> works, but maybe we want to have it be a specific integer if the top
> number is given? Any input?
New description:
{{{
sage: var('k')
k
sage: binomial(x,3)
1/6*(x - 2)*(x - 1)*x
sage: binomial(3,k)
---------------------------------------------------------------------------
TypeError: Either m or x-m must be an integer
}}}
From kcrisman:
Is this a bug? I would say yes, because
{{{
sage: binomial(x,k)
binomial(x, k)
}}}
works, but maybe we want to have it be a specific integer if the top
number is given? Any input?
Apply [attachment:trac_9634-symbolic_binomial.take2.patch]
--
Comment:
I uploaded a new patch that fixes doctests as well. This meant
reimplementing the `_eval_()` and `_evalf_()` methods to override those
defined in pynac.
Patchbot, apply only trac_9634-symbolic_binomial.take2.patch.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9634#comment:6>
Sage <http://www.sagemath.org>
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