#20019: Wrong approximate real roots of cubic equation and matrix eigenvalues
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Reporter: dlaurain | Owner:
Type: PLEASE CHANGE | Status: new
Priority: minor | Milestone: sage-7.1
Component: numerical | Resolution:
Keywords: eigenvalues cubic | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by jdemeyer):
You are computing a '''symbolic''' solution and then evaluating that
symbolic solution numerically. Then round-off errors are unavoidable. If
you don't want this, then don't use the symbolic ring: replace `matrix(SR,
...)` by `matrix(...)`
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Ticket URL: <http://trac.sagemath.org/ticket/20019#comment:1>
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