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fractional powers for polynomial variables bug #3678

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wdjoyner opened this issue Jul 19, 2008 · 5 comments
Closed

fractional powers for polynomial variables bug #3678

wdjoyner opened this issue Jul 19, 2008 · 5 comments
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c: algebra p: major / 3 t: bug
Milestone
sage-3.2.3

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@wdjoyner
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Raising a multivariate polynomial to a fractional power is broken.
A TypeError should be raised, but it is rounded instead.

sage: pr = PolynomialRing(QQ, "u,v")
sage: pr.injvar()
Defining u, v
sage: u^(1/2)
1

Component: algebra

Issue created by migration from https://trac.sagemath.org/ticket/3678
@wdjoyner wdjoyner added this to the sage-3.4 milestone Jul 19, 2008
@williamstein

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@williamstein williamstein changed the title Fractional powers for polynomial variables bug fractional powers for polynomial variables bug Jul 19, 2008
@aghitza
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aghitza commented Dec 21, 2008

comment:2

The attached patch fixes this by introducing the same type-check as in the univariate polynomial case.

@aghitza
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aghitza commented Dec 21, 2008

Attachment: trac_3678.patch.gz

@JohnCremona
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comment:3

Positive review. Patch applies cleanly to 3.2.2 and tests in sage/rings/polynomial pass.

@sagetrac-mabshoff
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Mannequin

sagetrac-mabshoff mannequin commented Dec 21, 2008

comment:4

Merged in Sage 3.2.3.alpha0

@sagetrac-mabshoff sagetrac-mabshoff mannequin closed this as completed Dec 21, 2008
@sagetrac-mabshoff sagetrac-mabshoff mannequin modified the milestones: sage-3.4, sage-3.2.3 Dec 21, 2008
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c: algebra p: major / 3 t: bug
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sage-3.2.3
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@wdjoyner @aghitza @williamstein @JohnCremona