====== GroIMP random number functions ====== ===== Uniform distribution ===== ''float random(float min, float max)'' Returns a uniformly distributed pseudorandom number between min and max ''int irandom(int min, int max)'' Returns a uniformly distributed integral pseudorandom number between min and max (inclusive). ===== Normal distribution ===== ''double normal(double mu, double sigma)'' Returns a pseudorandom number which is distributed according to a normal distribution with mean value mu and standard deviation sigma. ===== Log-normal distribution===== ''double lognormal(double mu, double sigma)'' ===== Discrete distribution ===== ''int distribution(float[] probabilities)'' Returns an integral pseudorandom number according to the discrete distribution probabilities., The value i has the probability probabilities i for 0 <= i < probabilities.length, the value probabilities.length has the remaining probability, i.e., the difference between the sum of probabilities and 1. ===== Poisson distribution (many other in math3.distribution)=====


import org.apache.commons.math3.distribution.PoissonDistribution;
double mean = 3.0; // lambda, the expected value
PoissonDistribution poisson = new PoissonDistribution(mean);
int value = poisson.sample();