Re: [Swarm-Support] "nan" message

[Rick Riolo]

i don't know what the underlying problem is,
but note that NaN is, i think, short for "not a number".
In any case, it often comes up when a program does
a divide by zero or other math op that results
in an undefined result (ie, a result not in
the allowed range of bit values for floating point numbers).

So...perhaps the way you are initializing things
leads to some variable getting intialized as 0,
and then its used in a division?

- r


Rick Riolo                           address@hidden
Center for the Study of Complex Systems (CSCS)
4477 Randall Lab
University of Michigan         Ann Arbor MI 48109-1120
Phone: 734 763 3323                  Fax: 734 763 9267
http://cscs.umich.edu/~rlr

On Wed, 22 Jun 2005, David Camacho Trujillo wrote:

> Date: Wed, 22 Jun 2005 12:28:30 +0200 (CEST)
> From: David Camacho Trujillo <address@hidden>
> Reply-To: Swarm Support <address@hidden>
> To: Swarm Support <address@hidden>
> Subject: [Swarm-Support] "nan" message
>
> Hi swarm community,
>
>
> I have a very simple problem that doesn´t let me sleep!
> I am utilizing a GA (a SWARM contribution) and under both GUI or batch mode it
> runs fine on the demo. But when I run this GA with my model, the
> getFitness method returns a “NAN” (not an integer) message  on the batch mode.
>
> I am new utilizing this batch mode, and on a previous problem, I have realize
> the way you initialized your model with the ObjectLoader (deprecated I 
> believe,
> but runs fine on the demo version) method make a big difference. Therefore, I
> have exactly the same parameters that initialized the GUI method there but 
> still
> this problem is there.
>
> For any comment, many thanks in advance,
> David
>
>
>
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