#13789: Opposite of spase polynomials
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Reporter: caruso | Owner: AlexGhitza
Type: defect | Status: new
Priority: major | Milestone: sage-5.6
Component: algebra | Resolution:
Keywords: sparse polynomials | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Xavier Caruso | Merged in:
Dependencies: | Stopgaps:
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Description changed by caruso:
Old description:
> {{{
> sage: R.<x> = PolynomialRing(ZZ,sparse=True)
> sage: a = x^100000000
> sage: -a # very very long time
> Traceback (most recent call last)
> ...
> KeyboardInterrupt
> }}}
>
> The reason is that {{a._neg_()}} tries to construct the list of all
> coefficients of {{{a}}}. The attached patch fixes this.
New description:
{{{
sage: R.<x> = PolynomialRing(ZZ,sparse=True)
sage: a = x^100000000
sage: -a # very very long time
Traceback (most recent call last)
...
KeyboardInterrupt
}}}
The reason is that {{{a._neg_()}}} tries to construct the list of all
coefficients of {{{a}}}. The attached patch fixes this.
--
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13789#comment:1>
Sage <http://www.sagemath.org>
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