#7391: Warn the user of incorrect results when an approximate ill-conditioned
matrix is used
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Reporter: jason | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-4.2.1
Component: linear algebra | Keywords:
Work_issues: | Author:
Reviewer: | Merged:
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This should probably give a warning to the user that the matrix is ill-
conditioned and you may get wrong results (like you do in this case).
{{{
sage: n = matrix([ [-0.3, 0.2, 0.1],
[0.2, -0.4, 0.4],
[0.1, 0.2, -0.5] ])
sage: n.echelon_form()
[ 1.00000000000000 0.000000000000000 0.000000000000000]
[0.000000000000000 1.00000000000000 0.000000000000000]
[0.000000000000000 0.000000000000000 1.00000000000000]
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7391>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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