Re: [Boost-users] seeding a boost::random number generator...?

From: Graham Reitz (graham.cpp_at_[hidden])
Date: 2007-10-23 17:42:22

Thanks for the reply Mike.   I am still stumped.  Any ideas on how I
can tell what type the "DataType" is?

Graham

On 10/23/07, Michael Linck <mgl_at_[hidden]> wrote:
> Looks like you seed it by converting your time stamp to whatever
> "DataType" you're trying to get back and using it as an arg to seed:
> "
> lass random::mersenne_twister
> {
> public:
>   typedef DataType result_type;
>   .
> .
> .
>   void seed();
>   void seed(DataType value);
>  " -- http://www.boost.org/libs/random/random-generators.html#mersenne_twister
>
> Or you can take the - possibly more complicated - route of trying to figure out how to use the Generator template.
>
> Hope that helps,
>
> mike
>
> On Tue, 2007-10-23 at 12:00 -0500, Graham Reitz wrote:
> > I am little confused on how to see a random generator.
> >
> > What am I missing?
> >
> >     // Grab the seed
> >     HighResTimer::Time time_secs = high_res_timer.getTime();
> >
> >     // Go ahead and truncate, it's just a seed
> >     boost::int32_t time = static_cast<boost::int32_t>(time_secs * 100000);
> >
> >     // produces randomness out of thin air
> >     // see pseudo-random number generators
> >     boost::mt19937 rng;
> >     rng.seed();  // How do you seed this with the time?
> >
> >     // distribution that maps to 0..1
> >     // see random number distributions
> >     boost::uniform_real<> zero_to_one(0,1);
> >
> >     // glues randomness with mapping
> >     boost::variate_generator<boost::mt19937&, boost::uniform_real<> >
> >         be_random zero_to_one);
> > _______________________________________________
> > Boost-users mailing list
> > Boost-users_at_[hidden]
> > http://lists.boost.org/mailman/listinfo.cgi/boost-users
>
> _______________________________________________
> Boost-users mailing list
> Boost-users_at_[hidden]
> http://lists.boost.org/mailman/listinfo.cgi/boost-users
>