#13980: numerical noise in variety(RDF)
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Reporter: zimmerma | Owner: AlexGhitza
Type: defect | Status: new
Priority: minor | Milestone: sage-5.7
Component: basic arithmetic | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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Consider the following:
{{{
sage: R.<x,y> = QQ[]; J = ideal([ x^7-(100*x-1)^2, y-x^7+1 ])
sage: J.variety(RDF)
[{y: 396340.890167, x: 26.612261084}]
}}}
On some machines the value of {{{x}}} is completely different (see #11672,
comment 14).
We should investigate why, since {{{RDF}}} ({{{RealDoubleField}}}) is a
wrapper for the {{{double}}}
C type, and according to IEEE 754 results should not differ from one
combination of architecture/operating-system/compiler to another one.
Paul
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13980>
Sage <http://www.sagemath.org>
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