At 1:12 PM +0100 5/3/08, Kevin Martin wrote:
I'm looking for a random distribution which allows me to generate enums with specified probabilities.
As a simple example I could have:
//The enum. typedef enum {vt_car, vt_bus, vt_walk, vt_cycle} vehicle_types;
//What I want to generate and the associated probabilities. boost::array<vehicle_types, 4> items = {vt_car, vt_bus, vt_walk, vt_cycle}; boost::array<double, 4> probabilities = {0.1, 0.2, 0.3, 0.4}
This should be pretty easy to write. I would be tempted to pass in a "const boost::array < std::pair<vehicle_type, double>, N>", which would give return values and probabilities; and use a std::vector<double> to calculate cumulative probabilities, and for each call to the RNG, do a binary search in the vector to find the right spot, and then return the associated value. -- -- Marshall Marshall Clow Idio Software <mailto:marshall@idio.com> It is by caffeine alone I set my mind in motion. It is by the beans of Java that thoughts acquire speed, the hands acquire shaking, the shaking becomes a warning. It is by caffeine alone I set my mind in motion.