On Nov 13, 2:09 pm, Juan Antonio Farré Basurte wrote:

 Hello,

 I'm using mt19937 random number generator, belonging to Boost.Random library, and it looks to ignore my call to seed.  I show relevant code.

 static mt19937 gen;  static MiniUni cien(1, 100);  static variate_generator d100(gen, cien);

 .....

 int main() {      {          struct timeval time;          gettimeofday(          gen.seed(time.tv_usec);      }

 ....

 And it generates the same sequence over and over. I've double-checked that time.tv_usec really changes.   Any help would be appreciated.  Thanks,

Try with a negative seed. gen.seed( - time.tv_usec); -- Alfredo