#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 | Keywords: sparse polynomials
Work issues: | Report Upstream: N/A
Reviewers: | Authors: Xavier Caruso
Merged in: | Dependencies:
Stopgaps: |
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{{{
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>
Sage <http://www.sagemath.org>
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