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From Gilles Sadowski <gil...@harfang.homelinux.org>
Subject [Math] Re: maximum number of iterations reached
Date Tue, 15 Mar 2011 11:10:44 GMT
On Tue, Mar 15, 2011 at 11:38:55AM +0100, Gilles Sadowski wrote:
> Hi.
> 
> [Please add a "[Math]" marker in the subject line of posts about the Commons
> Math project; this will raise the likelihood that the right people will
> notice your message.]

Oops, I forgot to do it :-}.

> On Tue, Mar 15, 2011 at 04:36:53PM +0800, Thomas Anderson wrote:
> > When using NormalDistributionImpl calss, I encounter the error throwing message
> > 
> > org.apache.commons.math.ConvergenceException: maximum number of
> > iterations reached
> >         at org.apache.commons.math.special.Gamma.regularizedGammaP(Gamma.java:176)
> >         at org.apache.commons.math.special.Erf.erf(Erf.java:52)
> >         at org.apache.commons.math.distribution.NormalDistributionImpl.cumulativeProbability(NormalDistributionImpl.java:105)
> >         at mypackage.Myclass.add(Myclass.java:109)
> >         at mypackage.Myclass.$Msger.call(Myclass.java:69)
> >         at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> >         at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> >         at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)
> >         at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206)
> >         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> >         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> >         at java.lang.Thread.run(Thread.java:662)
> > 
> > The value provided in cumulativeProbability is a double of current
> > time subtracting previous timestamped e.g. t_now - t_prev
> > 
> > What might cause this issue or how to fix it?
> > 
> 
> I don't know, but a good staring point would be to provide a fully working
> unit test that demonstrates the problem, and attach it to a new issue in the
> project's bug tracking page:
>    https://issues.apache.org/jira
> 
> 
> Thanks and best regards,
> Gilles
> 
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