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Conversion of pari elements to Sage fails on some negative valuation elements #12625

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roed314 opened this issue Mar 3, 2012 · 7 comments
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Conversion of pari elements to Sage fails on some negative valuation elements #12625

roed314 opened this issue Mar 3, 2012 · 7 comments
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@roed314
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c: padics p: major / 3 t: bug
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sage-5.0

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@roed314
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roed314 commented Mar 3, 2012 

sage: K = Qp(11,5)
sage: pari(K(11^-5)).sage()
ArithmeticError
sage: ZZ(pari(Qp(11)(11^-7)))
SEGFAULT

Component: padics

Author: David Roe

Reviewer: Xavier Caruso

Merged: sage-5.0.beta8

Issue created by migration from https://trac.sagemath.org/ticket/12625
@roed314 roed314 added this to the sage-5.0 milestone Mar 3, 2012
@roed314 roed314 self-assigned this Mar 3, 2012
@roed314
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roed314 commented Mar 3, 2012

comment:1

Attachment: 12625.patch.gz

@xcaruso
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xcaruso commented Mar 3, 2012

comment:2

I propose to modify the function padicprec() so that it computes itself the underlying prime number. Currently, one have:

sage: K = Qp(11,5)
sage: x = K(5)
sage: x
5 + O(11^5)
sage: y = pari(x)
sage: y.padicprec(11)
5
sage: y.padicprec(17)
  ***   not the same prime in padicprec.
  ***   Error in the PARI system. End of program.

@xcaruso
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xcaruso commented Mar 3, 2012

Reviewer: Xavier Caruso

@williamstein
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Attachment: trac_12625-review.patch.gz

apply after the other patch

@williamstein
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comment:3

I'm happy with this, but due to the amount I added, somebody else (anybody!) should sign off on it.

@roed314
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roed314 commented Mar 5, 2012

comment:4

Yep. That looks good.

@jdemeyer
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Merged: sage-5.0.beta8

@roed314 roed314 mentioned this issue Jan 9, 2014
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c: padics p: major / 3 t: bug
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