#15714: implement CFiniteSequence
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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 mmezzarobba):
Replying to [comment:33 rws]:
> {{{
> 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)
I don't think that's how sage objects are supposed to behave! I'd expect
the result of `1+s` not do depend on the order. Moreover, I'd expect that
things like `1.0+s` or `s+s'` where `s'` is another type of sequence can
be made to work in the long run even if they don't all work yet.
--
Ticket URL: <http://trac.sagemath.org/ticket/15714#comment:34>
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