#include <context.hpp>

Public Member Functions
	context_t (int seed, int counter=0)
	context_t (const boost::property_tree::ptree &json)
boost::property_tree::ptree	to_ptree () const
template<typename Distribution >
skylark::utility::random_samples_array_t < Distribution >	allocate_random_samples_array (size_t size, Distribution &distribution)
template<typename Distribution >
std::vector< typename Distribution::result_type >	generate_random_samples_array (size_t size, Distribution &distribution)
skylark::utility::random_array_t	allocate_random_array (size_t size)
int	random_int ()
size_t	get_counter ()
Friends
boost::property_tree::ptree &	operator<< (boost::property_tree::ptree &sk, const context_t &data)

Detailed Description

A structure that holds basic information about the state of the random number stream.

Definition at line 19 of file context.hpp.

Constructor & Destructor Documentation

skylark::base::context_t::context_t	(	int	seed,
		int	counter = `0`
	)		`[inline]`

Initialize context with a seed.

Parameters:

[in] seed Random seed to be used for all computations.

Definition at line 24 of file context.hpp.

skylark::base::context_t::context_t ( const boost::property_tree::ptree & json ) [inline]

Load context from a serialized JSON structure.

Parameters:

[in] filename of JSON structure encoding serialized state.

Definition at line 49 of file context.hpp.

Member Function Documentation

skylark::utility::random_array_t skylark::base::context_t::allocate_random_array ( size_t size ) [inline]

Returns a container of random numbers to be accessed as an array.

Parameters:

[in] size The size of the container.

Returns:: Random numbers' container.

This should be used as a global operation to keep the the internal state of the context synchronized.

Definition at line 138 of file context.hpp.

Referenced by random_int().

template<typename Distribution >

skylark::utility::random_samples_array_t<Distribution> skylark::base::context_t::allocate_random_samples_array	(	size_t	size,
		Distribution &	distribution
	)		`[inline]`

Returns a container of samples drawn from a distribution to be accessed as an array.

Parameters:

[in]	size	The size of the container.
[in]	distribution	The distribution to draw samples from.

Returns:: Random samples' container.

This is the main facility for creating a "stream" of samples of given size and distribution. size is needed for reserving up-front a portion of the linear space of the 2^64 samples that can be provided by a context with a fixed seed.

Definition at line 95 of file context.hpp.

Referenced by skylark::sketch::dense_transform_data_t< bstrand::cauchy_distribution >::build(), skylark::utility::uniform_matrix_t< FullyDistVec< IndexType, ValueType > >::generate(), skylark::utility::uniform_matrix_t< SpParMat< IndexType, ValueType, SpDCCols< IndexType, ValueType > > >::generate(), skylark::utility::uniform_matrix_t< elem::Matrix< ValueType > >::generate(), and skylark::utility::uniform_matrix_t< elem::DistMatrix< ValueType, CD, RD > >::generate().

template<typename Distribution >

std::vector<typename Distribution::result_type> skylark::base::context_t::generate_random_samples_array	(	size_t	size,
		Distribution &	distribution
	)		`[inline]`