Re: [Swarm-Support] Random number generators

[paul box]

If your program is called "heatbugs" (pulling some random name out of
thin air), you can type at the command line

> heatbugs --help

or

> heatbugs -?

And a list of command line options will come up.  One of those (I
think -v) will give a seed based on the time stamp, and another (I
think -S) will allow you to set the seed to a particular value.

On 6/20/07, Diego Corredor <address@hidden> wrote:
> But how do you change the random seed then?
>
> 2007/6/17, paul box <address@hidden>:
> > That's not a bug, that's a feature ;-)
> >
> > When you're developing a simulation, you're first worry is to get the
> > code doing what you think it's supposed to be doing.  If your program
> > depends on a random number stream somewhere, it can be very hard to
> > figure out if the funny behaviour comes from the model itself or
> > something unintended in your code.  This can be very hard to track
> > with random number streams.  By running with the same random number
> > stream each time, it's much easier to debug.
> >
> > A random number generator run several times with the same seed will
> > give you the same sequence of random numbers.  This is swarm's
> > default, and very helpful when you're developing.  Once you're happy
> > that your program is doing what you intended, then you can set new
> > random number seeds from the command line.  You can also record what
> > those seeds are in your experimental notes.  Knowing what seed you ran
> > your program with is important, if you want to be able to repeat your
> > results.
> >
> > Paul
> >
> > On 6/15/07, address@hidden <address@hidden> wrote:
> > >
> > > I am a new user to swarm and have my first model built!  I am using two 
> random
> > > number generators: getIntegerWithMin$withMax() and Globals.env.Randomized to
> > > randomized the actions.  Running the model multiple times I get the same 
> output.
> > >
> > > Shawn
> > > _______________________________________________
> > > Support mailing list
> > > address@hidden
> > > http://www.swarm.org/mailman/listinfo/support
> > >
> >
> >
> > --
> > //////////////////////////
> > // Paul Box
> > // Alice Springs, NT  Australia
> > //
> > _______________________________________________
> > Support mailing list
> > address@hidden
> > http://www.swarm.org/mailman/listinfo/support
> >
> _______________________________________________
> Support mailing list
> address@hidden
> http://www.swarm.org/mailman/listinfo/support


--
//////////////////////////
// Paul Box
// Alice Springs, NT  Australia
//