RandomLib::ExponentialDistribution Class Reference

The exponential distribution. More...

#include <RandomLib-2010-01/ExponentialDistribution.hpp>

List of all members.

Public Types
typedef RealType	result_type
Public Member Functions
template<class Random >
RealType	operator() (Random &r, RealType mu=RealType(1)) const throw ()

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Detailed Description

The exponential distribution.

Sample from the distribution exp(-x) for x >= 0. This uses the logarithm method, see Knuth, TAOCP, Vol 2, Sec 3.4.1.D. Example

   #include "RandomLib/ExponentialDistribution.hpp"

   RandomLib::Random r;
   std::cout << "Seed set to " << r.SeedString() << std::endl;
   RandomLib::ExponentialDistribution<double> expdist;
   std::cout << "Select from exponential distribution:";
   for (size_t i = 0; i < 10; ++i)
       std::cout << " " << expdist(r);
   std::cout << std::endl;

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Member Typedef Documentation

typedef RealType RandomLib::ExponentialDistribution::result_type

The type returned by ExponentialDistribution::operator()(Random&)

Definition at line 39 of file ExponentialDistribution.hpp.

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Member Function Documentation

template<class Random >

RealType RandomLib::ExponentialDistribution::operator()	(	Random &	r,
		RealType	mu = RealType(1)
	)		const throw () [inline]

Return a sample of type RealType from the exponential distribution and mean mu. This uses Random::FloatU() which avoids taking log(0) and allows rare large values to be returned. If mu = 1, minimum returned value = 0 with prob 1/2^p; maximum returned value = log(2)(p + e) with prob 1/2^{p + e}. Here p is the precision of real type RealType and e is the exponent range.

Definition at line 54 of file ExponentialDistribution.hpp.

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The documentation for this class was generated from the following file:

• ExponentialDistribution.hpp