Definition
An instance R of the data type dynamic_random_variate is a non-uniform random number generator. The generation process is governed by an array<int> w. Let [l .. r] be the index range of w and let W = w[i] be the total weight. Then any integer i in [l .. h] is generated with probability w[i]/W. The weight function w must be non-negative and W must be non-zero. The weight function can be changed dynamically.
The include file is <LEDA/random_variate.h>
#include < LEDA/random _variate.h >
Creation
dynamic_random_variate | R(array<int> w) | creates an instance R of type dynamic_random_variate. |
Operations
int | R.generate() | generates i in [l .. h] with probability w[i]/W. |
int | R.set_weight(int i, int g) | |
sets
w[i] to g and returns the old value of w[i].
Precondition: i in [l .. h]. |