Re: Timeout error

From: Nicholas Bolibruch <nboli_at_acanac.net>
Date: Thu, 23 Jun 2011 08:52:31 -0600

Sorry to take this topic on a slight detour, but I feel that I need to
ask this question to improve the results (and confidence) of my
simulations.

My understanding of Monte-Carlo simulation is that if I run a simulation
with 5E6 particles in a single run, it would have the same statistical
result as 5 independent runs at 1E6. Is there something else I'm
missing here?

On Wed, 2011-06-22 at 12:56 -0700, Alberto Fasso' wrote:
> 99% is not an error! It is a flag that an error could not be calculated.
> It needs at least 4 (better 5) independent runs to calculate a standard
> deviation. If the number of runs is less than 4, the FLUKA analysis
> tools print 99%. That number has no meaning, it is only a code for
> "error not calculable"
>
> Alberto
>
>
> On Tue, 21 Jun 2011, mir inamul haq jeri wrote:
>
> > Hello,
> > I got the reason of the 99% error.This is because i was running only one
> > batch this time while as i used to run 5 batches previously.So i would say
> > that each run serves as a batch of particles and for better statistics we
> > need to run as many batches as possible.I suppose that the statistical
> > deviation as calculated by code results from the distribution of average
> > values of each batch.I would appreciate any comments and suggestions on
> > this.
> > Thank you
> >
> > On Tue, Jun 21, 2011 at 3:16 PM, mir inamul haq jeri<mirinamulhaq_at_gmail.com
> >> wrote:
> >
> >> Thank you for your suggestion.
> >> Now the problem is that i am getting the usrbin errors only as 99% and 0%
> >> ir-respective of the number of particles that i run.i have run the same file
> >> previously when i was getting only few percent of errors.Although i tried it
> >> for the same number of particles as well as i had done previously when i was
> >> getting only 6-10% error, but now i am getting only 99% and 0%.since the
> >> values of yield/stars are different and the particle fluences are also
> >> different in different regions(as seen from usrbin) i think there is some
> >> error done by the code in calculating the errors.
> >> I will be looking forward for your suggestions
> >> Thank you
>
Received on Fri Jun 24 2011 - 10:23:52 CEST

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