gimbal_random.h File Reference

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Macros
#define	GBL_SEED_COUNT
#define	GBL_RAND_GENERATOR_DEFAULT

Typedefs
typedef int(*	GblRandomGeneratorFn) (void)

Functions
Basic API
Basic API for driving random number generation
uint64_t	gblSeed (uint8_t index)
void	gblSeedRand (uint8_t index, uint64_t seed)
int	gblRand (void)
void	gblSetRand (GblRandomGeneratorFn pFnGen)
Generators
Builtin random number generators
int	gblRandLibC (void)
int	gblRandLehmer (void)
Utilities
Utility functions for random data generation
GblBool	gblRandBool (void)
void	gblRandBuffer (void *pData, size_t size)
int	gblRandString (char *pBuffer, int minSize, int maxSize, const char *pCharList)
Discrete Distributions
Random number generation for different discrete distributions
int	gblRandBernoulli (float p)
int	gblRandBinomial (int n, float p)
int	gblRandEquilikely (int a, int b)
int	gblRandGeometric (float p)
int	gblRandPascal (int n, float p)
int	gblRandPoisson (float m)
Continuous Distributions
Random number generation for different continuous distributions
float	gblRandUniform (float a, float b)
float	gblRandExponential (float m)
float	gblRandErlang (int n, float b)
float	gblRandNormal (float m, float s)
float	gblRandLogNormal (float a, float b)
float	gblRandChisquare (int n)
float	gblRandStudent (int n)

Detailed Description

Random number generators and utilities.

This file contains the API and types surrounding random number generation. A series of utilities are provided for generating different types of random output (integer, float, bool, string, etc) as well as a variety of random number distributions.

Note

gblRandLehmer() and the various statistical disbributions are based on: "Random Number Generators: Good Ones Are Hard To Find" Steve Park and Keith Miller Communications of the ACM, October 1988

Todo

• Changing channels to swap between seeds

Author

1998 Steve Park

1998 Keith Miller

2023 Falco Girgis

Definition in file gimbal_random.h.

Macro Definition Documentation

GBL_SEED_COUNT

#define GBL_SEED_COUNT

Number of different seeds maintained.

Definition at line 30 of file gimbal_random.h.

GBL_RAND_GENERATOR_DEFAULT

#define GBL_RAND_GENERATOR_DEFAULT

Default random number generator backing gblRand()

Definition at line 34 of file gimbal_random.h.

Typedef Documentation

GblRandomGeneratorFn

typedef int(* GblRandomGeneratorFn) (void)

Function prototype for a custom random generator to be set with gblSetRand()

Definition at line 40 of file gimbal_random.h.

Function Documentation

gblSeed()

uint64_t gblSeed

(

uint8_t

index

)

Returns the seed associated with the given index.

gblSeedRand()

void gblSeedRand	(	uint8_t	index,
		uint64_t	seed )

Sets the seed associated with the given index to seed.

gblRand()

int gblRand

(

void

)

Returns a random number between 0 and RAND_MAX using the current random number generator.

gblSetRand()

void gblSetRand

(

GblRandomGeneratorFn

pFnGen

)

Sets the current random number generator to pFnGen, which drives gblRand()

gblRandLibC()

int gblRandLibC

(

void

)

The builtin rand() generator from the C standard library.

gblRandLehmer()

int gblRandLehmer

(

void

)

Lehmer linear congruential random number generator.

gblRandBool()

GblBool gblRandBool

(

void

)

Generates a random boolean value using the current generator.

gblRandBuffer()

void gblRandBuffer	(	void *	pData,
		size_t	size )

Fills in the given buffer with random bytes using the current generator.

gblRandString()

int gblRandString	(	char *	pBuffer,
		int	minSize,
		int	maxSize,
		const char *	pCharList )

Fills in buffer with a sized random word (optionally generated using a list of characters)

gblRandBernoulli()

int gblRandBernoulli

(

float

p

)

Generates a random integer using the current random number generator over a Bernoulli distribution.

gblRandBinomial()

int gblRandBinomial	(	int	n,
		float	p )

Generates a random integer using the current random number generator over a Binomial distribution.

gblRandEquilikely()

int gblRandEquilikely	(	int	a,
		int	b )

Generates a random integer using the current random number generator over the given range [a, b].

gblRandGeometric()

int gblRandGeometric

(

float

p

)

Generates a random integer using the current random number generator over a Geometric distribution.

gblRandPascal()

int gblRandPascal	(	int	n,
		float	p )

Generates a random integer using the current random number generator over a Pascal distribution.

gblRandPoisson()

int gblRandPoisson

(

float

m

)

Generates a random integer using the current random number generator over a Poisson distribution.

gblRandUniform()

float gblRandUniform	(	float	a,
		float	b )

Generates a random float using the current random number generator over the given range [a, b].

gblRandExponential()

float gblRandExponential

(

float

m

)

Generates a random float using the current random number generator over an Exponential distribution.

gblRandErlang()

float gblRandErlang	(	int	n,
		float	b )

Generates a random float using the current random number generator over an Erlang distribution.

gblRandNormal()

float gblRandNormal	(	float	m,
		float	s )

Generates a random integer using the current random number generator over a Normal distribution.

gblRandLogNormal()

float gblRandLogNormal	(	float	a,
		float	b )

Generates a random integer using the current random number generator over a Log Normal distribution.

gblRandChisquare()

float gblRandChisquare

(

int

n

)

Generates a random integer using the current random number generator over a Chisquare distribution.

gblRandStudent()

float gblRandStudent

(

int

n

)

Generates a random integer using the current random number generator over a Student distribution.