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/*
* random.cc
*
* Created on: May 23, 2011
* Author: jakob
*/
#include <math.h>
#include "random.h"
namespace vhc {
namespace random {
void seed(unsigned int s) {
if (s == 0) {
srand(time(0));
} else {
srand(s);
}
}
double uniform(double a, double b) {
return a + (rand() / double(RAND_MAX)) * (b - a);
}
double gaussian(double average, double standardDeviation) {
double v1;
double v2;
double s ;
do {
v1 = uniform(-1.0, 1.0);
v2 = uniform(-1.0, 1.0);
s = v1*v1 + v2*v2;
} while ((s >= 1.0) or (s == 0.0));
double x(sqrt(-2.0 * log(s) / s));
if (uniform(0.0, 1.0) > 0.5)
x *= v1;
else
x *= v2;
return average + standardDeviation * x;
}
} //random
} //vhc
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