The Poisson Distribution

Random: unsigned int gsl_ran_poisson (const gsl_rng * r, double mu)

This function returns a random integer from the Poisson distribution with mean mu. The probability distribution for Poisson variates is,

for @c{$k \ge 0$} @math{k >= 0}.

Function: double gsl_ran_poisson_pdf (unsigned int k, double mu)

This function computes the probability @math{p(k)} of obtaining k from a Poisson distribution with mean mu, using the formula given above.