1 #ifndef STAN_MATH_PRIM_MAT_PROB_MULTINOMIAL_RNG_HPP 2 #define STAN_MATH_PRIM_MAT_PROB_MULTINOMIAL_RNG_HPP 12 #include <boost/math/special_functions/gamma.hpp> 13 #include <boost/random/uniform_01.hpp> 14 #include <boost/random/variate_generator.hpp> 21 inline std::vector<int>
25 static const char*
function(
"multinomial_rng");
30 std::vector<int> result(theta.size(), 0);
31 double mass_left = 1.0;
33 for (
int k = 0; n_left > 0 && k < theta.size(); ++k) {
34 double p = theta[k] / mass_left;
38 mass_left -= theta[k];
void check_simplex(const char *function, const char *name, const Eigen::Matrix< T_prob, Eigen::Dynamic, 1 > &theta)
Check if the specified vector is simplex.
std::vector< int > multinomial_rng(const Eigen::Matrix< double, Eigen::Dynamic, 1 > &theta, int N, RNG &rng)
int binomial_rng(int N, double theta, RNG &rng)
void check_positive(const char *function, const char *name, const T_y &y)
Check if y is positive.