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

From: Michael Linck (mgl_at_[hidden])
Date: 2007-10-23 13:12:26

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);
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