random.h

   1 // Random number generation routines
   2 // Copyright © 2009 The University of Chicago
   3 #ifndef RANDOM_H
   4 #define RANDOM_H
   5
   6 #include <cstdlib>
   7
   8 namespace linguistica {
   9
  10 /// random float chosen uniformly from the interval [-1/2, 1/2]
  11 /// requires: std::srand has already been called to seed the RNG
  12 inline float random_small_float()
  13 {
  14         // let the RNG calm down a bit
  15         for (int i = 0; i < 25; ++i)
  16                 static_cast<void>(std::rand());
  17         return (static_cast<float>(std::rand()) /
  18                 static_cast<float>(RAND_MAX)) - float(0.5);
  19 }
  20
  21 } // namespace linguistica
  22
  23 #endif // RANDOM_H