Re: phythia random number seed

[Eugene Chudakov <gen@jlab.org>]

Blake,

if you use bggen, you can set a new seed for each run,
changing the line in the input FFREAD file: 
RNDMSEQ    N
where N is an integer number.

The runs with different N values will be statistically independent.
See src/programs/Simulation/bggen/README

I used to do such things with a script which would add a new line into 
the basic file (the STOP command should be removed).


Eugene

On Fri, 8 May 2009, Blake Leverington wrote:

> Hi,
>
> Is anyone aware of where to give Pythia a new default initial seed for the 
> random number generator at runtime? I want to create a large background data 
> set but I'm limited to around 2 million events due to file size limitations. 
> Therefore I want to make multiple Pythia output files but repeated runs of 
> Pythia seem to give me identical data sets which seems to be from having the 
> same initial seed for generating random numbers. I checked the pythia6 
> manuals but didn't have much success on where to set this. If anyone is more 
> familiar with this it would be appreciated.
>
> -Blake
>