#14548: coefficients method for polynomials and power series
-------------------------+-------------------------------------------------
Reporter: roed | Owner: AlexGhitza
Type: | Status: needs_review
defect | Milestone: sage-duplicate/invalid/wontfix
Priority: major | Resolution:
Component: | Merged in:
algebra | Reviewers:
Keywords: | Work issues:
Authors: | Commit:
Report Upstream: N/A | 7b56441867da56bb3d41ef1829432bf098f3489d
Branch: | Stopgaps:
u/chapoton/14548 |
Dependencies: |
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Changes (by rws):
* status: new => needs_review
* milestone: sage-6.4 => sage-duplicate/invalid/wontfix
Old description:
> In #2081 we introduced a `coefficients` method for univariate polynomials
> and power series, which only returns the nonzero coefficients.
>
> {{{
> sage: R.<x> = QQ[]
> sage: (x^2+1).coefficients()
> [1, 1]
> }}}
>
> * The result for `x^2 + 1` should be `[1, 0, 1]`.
> * We should add a method `coefficients_nonzero` for univariate and
> multivariable polynomials and power series that does what `coefficients`
> now does.
> * We should deprecate the `coefficients` method on multivariate
> polynomials.
New description:
In #2081 we introduced a `coefficients` method for univariate polynomials
and power series, which only returns the nonzero coefficients.
{{{
sage: R.<x> = QQ[]
sage: (x^2+1).coefficients()
[1, 1]
}}}
* The result for `x^2 + 1` should be `[1, 0, 1]`.
* We should add a method `coefficients_nonzero` for univariate and
multivariable polynomials and power series that does what `coefficients`
now does.
* We should deprecate the `coefficients` method on multivariate
polynomials.
See also #17518 and the sage-devel discussion linked there.
--
Comment:
See also #17518 and the sage-devel discussion linked there. #17518 clashes
with this ticket because it implements a different solution, i.e., a
`sparse` keyword. This is certainly better than changing a much used
function name. Note also that with #17518 and #17438 the interface to the
same functions in `SR` and `PowerSeriesRing` is unified.
I therefore propose to obsolete this ticket.
--
Ticket URL: <http://trac.sagemath.org/ticket/14548#comment:13>
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