Exponentially Distributed random varThis class supports the creation of objects that return random numbers from a fixed exponential distribution. More...
#include <random-variable.h>
Public Member Functions | |
ExponentialVariable () | |
Constructs an exponential random variable with a mean value of 1.0. More... | |
ExponentialVariable (double m) | |
Constructs an exponential random variable with a specified mean. More... | |
ExponentialVariable (double m, double b) | |
Constructs an exponential random variable with specified mean and upper limit. More... | |
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RandomVariable () | |
RandomVariable (const RandomVariable &o) | |
~RandomVariable () | |
uint32_t | GetInteger (void) const |
Returns a random integer integer from the underlying distribution. More... | |
double | GetValue (void) const |
Returns a random double from the underlying distribution. More... | |
RandomVariable & | operator= (const RandomVariable &o) |
Additional Inherited Members | |
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RandomVariable (const RandomVariableBase &variable) | |
RandomVariableBase * | Peek (void) const |
Exponentially Distributed random var
This class supports the creation of objects that return random numbers from a fixed exponential distribution.
It also supports the generation of single random numbers from various exponential distributions.
The probability density function of an exponential variable is defined over the interval [0, +inf) as: where
The bounded version is defined over the interval [0,b] as: . Note that in this case the true mean is
Definition at line 242 of file random-variable.h.
ns3::ExponentialVariable::ExponentialVariable | ( | ) |
Constructs an exponential random variable with a mean value of 1.0.
Definition at line 614 of file random-variable.cc.
References NS_LOG_FUNCTION.
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explicit |
Constructs an exponential random variable with a specified mean.
m | Mean value for the random variable |
Definition at line 619 of file random-variable.cc.
References NS_LOG_FUNCTION.
ns3::ExponentialVariable::ExponentialVariable | ( | double | m, |
double | b | ||
) |
Constructs an exponential random variable with specified mean and upper limit.
Since exponential distributions can theoretically return unbounded values, it is sometimes useful to specify a fixed upper limit. Note however when the upper limit is specified, the true mean of the distribution is slightly smaller than the mean value specified: .
m | Mean value of the random variable |
b | Upper bound on returned values |
Definition at line 624 of file random-variable.cc.
References NS_LOG_FUNCTION.