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Posted to issues@commons.apache.org by "Luc Maisonobe (JIRA)" <ji...@apache.org> on 2011/04/09 21:50:05 UTC
[jira] [Issue Comment Edited] (MATH-464) LegendreGaussIntegrator
ignores defaultMaximalIterationCount and does 38 million iterations
[ https://issues.apache.org/jira/browse/MATH-464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13017945#comment-13017945 ]
Luc Maisonobe edited comment on MATH-464 at 4/9/11 7:49 PM:
------------------------------------------------------------
We restarted a thread about this a few days after the previous comment on this issue.
The thread can be read here: http://markmail.org/thread/rnazrggnnuehz4qv
I think adding maxEvaluations while still preserving the existing maxIterations would be fine.
was (Author: luc):
We restarted a thread about this a few days after the previous comment on this issue.
The thread can be read here: http://commons.markmail.org/thread/cajgm5lwphlse3lr
I think adding maxEvaluations while still preserving the existing maxIterations would be fine.
> LegendreGaussIntegrator ignores defaultMaximalIterationCount and does 38 million iterations
> -------------------------------------------------------------------------------------------
>
> Key: MATH-464
> URL: https://issues.apache.org/jira/browse/MATH-464
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 2.1
> Reporter: Michael Borcherds
> Priority: Critical
> Fix For: 3.0
>
> Original Estimate: 3h
> Remaining Estimate: 3h
>
> The following code results in count = 37801710 which is effectively an infinite loop for typical functions we are using
> (in GeoGebra)
> The argument defaultMaximalIterationCount = 100 is being ignored
> This is the version we are using:
> http://www.geogebra.org/trac/browser/trunk/geogebra/org/apache/commons/math/analysis/integration/LegendreGaussIntegrator.java
> LegendreGaussIntegrator gauss = new LegendreGaussIntegrator(5, 100);
>
> try {
> double result = gauss.integrate(new testFun(), -10, 0.32462367623786328);
> } catch (Exception ee) {
> ee.printStackTrace();
> }
> class testFun implements UnivariateRealFunction {
> public double value(double x) throws FunctionEvaluationException {
> count ++;
> if (x>=0 && x<=5) return 0.2; else return 0;
> }
> }
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