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From "Anthony Maidment (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MATH-871) math3 SecantSolver can return Double.INFINITE
Date Thu, 27 Sep 2012 14:20:07 GMT
Anthony Maidment created MATH-871:
-------------------------------------

             Summary: math3 SecantSolver can return Double.INFINITE
                 Key: MATH-871
                 URL: https://issues.apache.org/jira/browse/MATH-871
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.0
            Reporter: Anthony Maidment
            Priority: Minor


In doSolve(), I had a situation in which f0 and f1, from computeObjectiveValue() on lines
77 & 78, were the same value.

Then when it calculates the next appromixation at line 101:
final double x = x1 - ((f1 * (x1 - x0)) / (f1 - f0));
The denominator is then zero, and the next approximation is Double.INFINITE.

I was able to work around this in this particular instance by relaxing the accuracy requirements
of the solver, although I haven't yet fully tested the downstream implications of this change.

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