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From "Thomas Neidhart (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MATH-842) Investigate why Bland's rule in Simplex Solver still creates cycles
Date Sun, 05 Aug 2012 16:39:02 GMT
Thomas Neidhart created MATH-842:
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             Summary: Investigate why Bland's rule in Simplex Solver still creates cycles
                 Key: MATH-842
                 URL: https://issues.apache.org/jira/browse/MATH-842
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.1
            Reporter: Thomas Neidhart


As a consequence of MATH-828, Bland's rule has been introduced to prevent cycling. Now there
are cases where cycles can still occur (see testMath828Cycle in SimplexSolverTest). These
cases have for now been solved with a simple heuristic:

 * after maxIterations / 2 -> ignore Bland's rule

This issue has been created to further investigate the problem and come up with a more cleaner
solution.

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