vcg::math::SubtractiveRingRNG Class Reference

#include <random_generator.h>

Inheritance diagram for vcg::math::SubtractiveRingRNG:

[legend]

List of all members.

Public Member Functions
unsigned int	generate (unsigned int limit=0xffffffffu)
	Return a random number in the given range (limit) using the Subtractive Ring method.
double	generate01 ()
	Return a random number in the [0,1) real interval using the Subtractive Ring method.
double	generate01closed ()
	Returns a random number in the [0,1] real interval using the Subtractive Ring method.
double	generate01open ()
	Generates a random number in the (0,1) real interval using the Subtractive Ring method.
void	initialize (unsigned int seed)
	(Re-)initialize with a given seed.
	SubtractiveRingRNG (int default_seed=161803398u)
virtual	~SubtractiveRingRNG ()
Private Attributes
size_t	_M_index1
size_t	_M_index2
unsigned int	_M_table [55]

---

Detailed Description

Uniform RNG derived from a STL extension of sgi.

It is based on the Subtractive Ring method. This implementation assumes that int is 32 bits.

References

D. E. Knuth, The Art of Computer Programming. Volume 2: Seminumerical Algorithms, 2nd Edition. Addison-Wesley, 1981. (section 3.6 of Knuth for an implementation of the subtractive method in FORTRAN) (section 3.2.2 of Knuth analyzes this class of algorithms)

Definition at line 79 of file random_generator.h.

---

Constructor & Destructor Documentation

vcg::math::SubtractiveRingRNG::SubtractiveRingRNG

(

int

default_seed = 161803398u

)

[inline]

Definition at line 94 of file random_generator.h.

virtual vcg::math::SubtractiveRingRNG::~SubtractiveRingRNG

(

)

[inline, virtual]

Definition at line 99 of file random_generator.h.

---

Member Function Documentation

unsigned int vcg::math::SubtractiveRingRNG::generate

(

unsigned int

limit = 0xffffffffu

)

[inline, virtual]

Return a random number in the given range (limit) using the Subtractive Ring method.

Implements vcg::math::RandomGenerator.

Definition at line 128 of file random_generator.h.

double vcg::math::SubtractiveRingRNG::generate01

(

)

[inline, virtual]

Return a random number in the [0,1) real interval using the Subtractive Ring method.

Implements vcg::math::RandomGenerator.

Definition at line 137 of file random_generator.h.

double vcg::math::SubtractiveRingRNG::generate01closed

(

)

[inline, virtual]

Returns a random number in the [0,1] real interval using the Subtractive Ring method.

Implements vcg::math::RandomGenerator.

Definition at line 145 of file random_generator.h.

double vcg::math::SubtractiveRingRNG::generate01open

(

)

[inline, virtual]

Generates a random number in the (0,1) real interval using the Subtractive Ring method.

Implements vcg::math::RandomGenerator.

Definition at line 153 of file random_generator.h.

void vcg::math::SubtractiveRingRNG::initialize

(

unsigned int

seed

)

[inline, virtual]

(Re-)initialize with a given seed.

Implements vcg::math::RandomGenerator.

Definition at line 106 of file random_generator.h.

---

Member Data Documentation

size_t vcg::math::SubtractiveRingRNG::_M_index1 [private]

Definition at line 87 of file random_generator.h.

size_t vcg::math::SubtractiveRingRNG::_M_index2 [private]

Definition at line 88 of file random_generator.h.

unsigned int vcg::math::SubtractiveRingRNG::_M_table[55] [private]

Definition at line 86 of file random_generator.h.

---

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

• random_generator.h