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From "Dennis Hendriks (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-631) "RegulaFalsiSolver" failure
Date Fri, 12 Aug 2011 23:13:27 GMT

    [ https://issues.apache.org/jira/browse/MATH-631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13084454#comment-13084454
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Dennis Hendriks commented on MATH-631:
--------------------------------------

bq. contains everything

I agree. I was just wondering why a message that seems to be exactly the same as the exception
was not used, as it kind of looked like it was created just for this purpose...

bq. I proposed to use this approach (combining message items with the "addMessage" method
of "ExceptionContext") in order to reduce the number of messages in the "LocalizedFormats"
enum. Too many of them are just slight variations on a same theme.

Ah, so then the MAX_EVALUATIONS_EXCEEDED is just a remnant of the past that should be eliminated,
by replacing it everywhere by the more general MAX_COUNT_EXCEEDED?

> "RegulaFalsiSolver" failure
> ---------------------------
>
>                 Key: MATH-631
>                 URL: https://issues.apache.org/jira/browse/MATH-631
>             Project: Commons Math
>          Issue Type: Bug
>            Reporter: Gilles
>             Fix For: 3.0
>
>
> The following unit test:
> {code}
> @Test
> public void testBug() {
>     final UnivariateRealFunction f = new UnivariateRealFunction() {
>             @Override
>             public double value(double x) {
>                 return Math.exp(x) - Math.pow(Math.PI, 3.0);
>             }
>         };
>     UnivariateRealSolver solver = new RegulaFalsiSolver();
>     double root = solver.solve(100, f, 1, 10);
> }
> {code}
> fails with
> {noformat}
> illegal state: maximal count (100) exceeded: evaluations
> {noformat}
> Using "PegasusSolver", the answer is found after 17 evaluations.

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