#15714: implement CFiniteSequence
-------------------------------------+-------------------------------------
Reporter: rws | Owner: rws
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.4
Component: combinatorics | Resolution:
Keywords: recurrence, | Merged in:
sequence, ogf | Reviewers:
Authors: Ralf Stephan | Work issues:
Report Upstream: N/A | Commit:
Branch: | 0656d07dfa6dfa57f78fb1c2cfb7572a3c842801
public/ticket/15714 | Stopgaps:
Dependencies: |
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Comment (by rws):
Please compare:
{{{
sage: fr = (x/(1+x)).fraction(QQ)
sage: 1+fr
(2*x + 1)/(x + 1)
sage: type(_)
<class
'sage.rings.fraction_field_element.FractionFieldElement_1poly_field'>
sage: fr+1
(2*x + 1)/(x + 1)
sage: type(_)
<class
'sage.rings.fraction_field_element.FractionFieldElement_1poly_field'>
}}}
versus
{{{
sage: R.<x> = PolynomialRing(QQ, 'x')
sage: s = CFiniteSequence(x/(1+x))
/home/ralf/sage/local/lib/python2.7/site-
packages/sage/rings/cfinite_sequence.py:212: DeprecationWarning: This
method is deprecated.
See http://trac.sagemath.org/16201 for details.
R.set_default_prec(alen)
sage: s
C-finite sequence, generated by x/(x + 1)
sage: 1+s
(2*x + 1)/(x + 1)
sage: s+1
C-finite sequence, generated by (2*x + 1)/(x + 1)
sage: CFiniteSequence(1)+s
C-finite sequence, generated by (2*x + 1)/(x + 1)
}}}
What do yu think is wrong there? (Will fix the deprecation warning)
--
Ticket URL: <http://trac.sagemath.org/ticket/15714#comment:33>
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