This is the mail archive of the
gsl-discuss@sources.redhat.com
mailing list for the GSL project.
Re: Random Number Seed
- From: Frederick Joseph Ross <fjr6b at galileo dot phys dot virginia dot edu>
- To: Przemyslaw Sliwa <przemyslaw dot sliwa at db dot com>
- Cc: gsl-discuss at sources dot redhat dot com
- Date: Mon, 1 Mar 2004 11:14:18 -0500 (EST)
- Subject: Re: Random Number Seed
The function you're after (at least on POSIX systems) is time in time.h
(try man 2 time if you're on a Linux or BSD machine). I nearly always
seed my generator this way at the start of a program. For instance,
#include <gsl/gsl_rng.h>
#include <time.h>
int main(int argc, char *argv[])
{
const gsl_rng_type *T = gsl_rng_mt19937;
gsl_rng *r = gsl_rng_alloc(T);
gsl_rng_set(r, (unsigned long) time(NULL))
...
}
Hope this helps.
Fred Ross
High Energy Physics Laboratory
University of Virginia
> Hi,
>
> I have a question:
> When one wants to use the random number seed different than the default one (equals to 0) one can use the macro GSL_RNG_SEED=seed from the command line. I would like to use the system time as the seed and have no idea how one can use the it from the command line. Therefore I want to use the function clock() in my C program. Could you help me how the seed can be initialized from the function claock() within my c program?
>
> Thank you for help,
>
> Pshem
>
>
>
>
> --------------------------------------------------
> Deutsche Bank AG
> Risk Controlling
> Credit Risk Engineering & Implementation
> / Daily Credit Risk
>
> Tel.: (+44 20) 754 59676 London
> Fax: (+44 20) 754 71060 London
>
> ----------------------------------------------------
>
>
> --
>
> This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden.
>