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From Gilles Sadowski <gil...@harfang.homelinux.org>
Subject Re: maximum number of iterations reached
Date Tue, 15 Mar 2011 10:38:55 GMT
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.]

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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