#15941: Incorrect matrix vector multiplication with real interval field RIF
elements
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Reporter: tcoffee | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.2
Component: linear algebra | Keywords: RIF matrix vector
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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Occurs when elements are RealIntervalField intervals containing zero.
{{{
sage: matrix(((1,0),(0,1)))*vector((RIF(-1,1),RIF(-1,1)))
(0, 0)
sage: _ == vector((RIF(0), RIF(0)))
True
}}}
Seems likely this is due to applying a zero test that is not valid for
interval terms.
It is not a coercion issue: the above behaves identically when the matrix
elements are made explicitly RIF.
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Ticket URL: <http://trac.sagemath.org/ticket/15941>
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