#include "xbt/random.hpp"
#include "xbt/asserts.h"
+#include <limits>
#include <random>
namespace simgrid {
unsigned long gmax = mt19937_gen.max();
unsigned long grange = gmax - gmin + 1;
unsigned long range = max - min + 1;
+ xbt_assert(
+ min < max || min == max,
+ "The maximum value for the uniform integer distribution must be greater than or equal to the minimum value");
xbt_assert(range < grange || range == grange, "The current implementation of the uniform integer distribution does "
"not allow range to be higher than mt19937's range");
unsigned long mult = grange / range;
double exponential(double lambda)
{
- unsigned long numerator = mt19937_gen() - mt19937_gen.min();
- unsigned long divisor = mt19937_gen.max() - mt19937_gen.min();
- return -1 / lambda * log(numerator / divisor);
+ return -1 / lambda * log(uniform_real(0, 1));
+}
+
+double normal(double mean, double sd)
+{
+ double u1 = 0;
+ while (u1 < std::numeric_limits<double>::min()) {
+ u1 = uniform_real(0, 1);
+ }
+ double u2 = uniform_real(0, 1);
+ double z0 = sqrt(-2.0 * log(u1)) * cos(2 * M_PI * u2);
+ return z0 * sd + mean;
+}
+
+void set_mersenne_seed(int seed)
+{
+ mt19937_gen.seed(seed);
}
} // namespace random