Random Number Generators

Namespaces
namespace	graphlab::random

Functions
void	graphlab::random::seed ()
void	graphlab::random::seed (const size_t seed_value)
void	graphlab::random::nondet_seed ()
void	graphlab::random::time_seed ()
generator &	graphlab::random::get_source ()
template<typename NumType >
NumType	graphlab::random::uniform (const NumType min, const NumType max)
template<typename NumType >
NumType	graphlab::random::fast_uniform (const NumType min, const NumType max)
double	graphlab::random::rand01 ()
int	graphlab::random::rand ()
double	graphlab::random::gamma (const double alpha=double(1))
double	graphlab::random::gaussian (const double mean=double(0), const double stdev=double(1))
double	graphlab::random::normal (const double mean=double(0), const double stdev=double(1))
bool	graphlab::random::bernoulli (const double p=double(0.5))
bool	graphlab::random::fast_bernoulli (const double p=double(0.5))
template<typename Double >
size_t	graphlab::random::multinomial (const std::vector< Double > &prb)
template<typename Double >
size_t	graphlab::random::multinomial_cdf (const std::vector< Double > &cdf)
template<typename T >
std::vector< T >	graphlab::random::permutation (const size_t nelems)
template<typename T >
void	graphlab::random::shuffle (std::vector< T > &vec)
template<typename Iterator >
void	graphlab::random::shuffle (Iterator begin, Iterator end)

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Detailed Description

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Function Documentation

bool graphlab::random::bernoulli ( const double  p = double(0.5) )

inline

Draw a sample from a bernoulli distribution

Definition at line 428 of file random.hpp.

bool graphlab::random::fast_bernoulli ( const double  p = double(0.5) )

inline

Draw a sample form a bernoulli distribution using the faster generator

Definition at line 436 of file random.hpp.

template<typename NumType >

NumType graphlab::random::fast_uniform ( const NumType  min, const NumType  max  )

inline

Generate a random number in the uniform real with range [min, max) or [min, max] if the number type is discrete.

Definition at line 376 of file random.hpp.

double graphlab::random::gamma ( const double  alpha = double(1) )

inline

Generate a random number from a gamma distribution.

Definition at line 398 of file random.hpp.

double graphlab::random::gaussian ( const double  mean = double(0), const double  stdev = double(1)  )

inline

Generate a gaussian random variable with zero mean and unit standard deviation.

Definition at line 409 of file random.hpp.

generator & graphlab::random::get_source

(

)

Get the local generator

Definition at line 242 of file random.cpp.

template<typename Double >

size_t graphlab::random::multinomial ( const std::vector< Double > &  prb )

inline

Generate a draw from a multinomial. This function automatically normalizes as well.

Definition at line 446 of file random.hpp.

template<typename Double >

size_t graphlab::random::multinomial_cdf ( const std::vector< Double > &  cdf )

inline

Generate a draw from a cdf;

Definition at line 456 of file random.hpp.

void graphlab::random::nondet_seed

(

)

Seed all generators using a nondeterministic source

Definition at line 264 of file random.cpp.

double graphlab::random::normal ( const double  mean = double(0), const double  stdev = double(1)  )

inline

Generate a gaussian random variable with zero mean and unit standard deviation.

Definition at line 419 of file random.hpp.

template<typename T >

std::vector<T> graphlab::random::permutation ( const size_t  nelems )

inline

Construct a random permutation

Definition at line 467 of file random.hpp.

int graphlab::random::rand ( )

inline

Simulates the standard rand function as defined in cstdlib

Definition at line 391 of file random.hpp.

double graphlab::random::rand01 ( )

inline

Generate a random number between 0 and 1

Definition at line 385 of file random.hpp.

void graphlab::random::seed

(

)

Seed all generators using the default seed

Definition at line 262 of file random.cpp.

void graphlab::random::seed

(

size_t

seed_value

)

Seed all generators using an integer

Definition at line 268 of file random.cpp.

template<typename T >

void graphlab::random::shuffle ( std::vector< T > &  vec )

inline

Shuffle a standard vector

Definition at line 477 of file random.hpp.

template<typename Iterator >

void graphlab::random::shuffle ( Iterator  begin, Iterator  end  )

inline

Shuffle a range using the begin and end iterators

Definition at line 486 of file random.hpp.

void graphlab::random::time_seed

(

)

Seed all generators using the current time in microseconds

Definition at line 266 of file random.cpp.

template<typename NumType >

NumType graphlab::random::uniform ( const NumType  min, const NumType  max  )

inline

Generate a random number in the uniform real with range [min, max) or [min, max] if the number type is discrete.

Definition at line 365 of file random.hpp.