Re: [Boost-users] Boost.Random Generator ignores seed

Subject: Re: [Boost-users] Boost.Random Generator ignores seed
From: Juan Antonio Farré Basurte (jafb_at_[hidden])
Date: 2010-11-13 18:36:39

 On Sun 14/11/10 00:04 , alfC alfredo.correa_at_[hidden] sent:
 On Nov 13, 2:09 pm, Juan Antonio Farré Basurte 
 wrote:
 > Â Hello,
 >
 > Â I'm using mt19937 random number generator, belonging to Boost.Random
 > library, and it looks to ignore my call to seed.
 > Â I show relevant code.
 >
 > Â static mt19937 gen;
 > Â static MiniUni cien(1, 100);
 > Â static variate_generator d100(gen, cien);
 >
 > Â .....
 >
 > Â int main() {
 > Â Â Â Â  {
 > Â Â Â Â  Â Â Â  struct timeval time;
 > Â Â Â Â  Â Â Â  gettimeofday(
 > Â Â Â Â  Â Â Â  gen.seed(time.tv_usec);
 > Â Â Â Â  }
 >
 > Â ....
 >
 > Â And it generates the same sequence over and over. I've double-checked
 > that time.tv_usec really changes.
 > Â  Any help would be appreciated.
 > Â Thanks,

 Try with a negative seed.

 gen.seed( - time.tv_usec);

 -- Alfredo

 Mmmm... I'm afraid it didn't work...
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