MathFunctions.C File Reference

#include "Util/MathFunctions.H"
#include "Util/log.H"
#include <cmath>
#include <sys/types.h>
#include <unistd.h>

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Functions
bool	isFinite (const byte &arg)
	Function to check for finite value.
bool	isFinite (const int16 &arg)
	Function to check for finite value.
bool	isFinite (const int32 &arg)
	Function to check for finite value.
bool	isFinite (const float &arg)
	Function to check for finite value.
bool	isFinite (const double &arg)
	Function to check for finite value.
void	initRandomNumbers ()
	Initialize random seeds from pseudo-random sources (e.g. time(), getpid()).
void	initRandomNumbersZero ()
	Initialize random seeds with zero, to produce deterministic pseudo-random sequences.
double	randomDouble ()
	Generate a random double in [0.0,1.0).
double	randomDoubleFromNormal (const double s)
	Generate a random double from a normal distribution with mean zero and standard deviation s.
int	randomUpToIncluding (const int n)
	Generate a random integer in [0,n] (i.e., including n).
int	randomUpToNotIncluding (const int n)
	Generate a random integer in [0,n) (i.e., not including n).
double	ran2 (int &idum)
	Random number generator from Numerical Recipes in C book.
int	getIdum (const bool useRandom)
	Get a random seed for ran2.
double	gasdev (int &idum)
	Randomly distributed Gaussian deviate with zero mean and unit variance.
double	expdev (int &idum)
	Randomly distributed Exponential deviate.
double	lngamma (double x)
	Compute log of Gamma.
double	poisson (const unsigned int k, const double mu)
	Compute probability of drawing a value k from a Poisson of mean mu.
double	AUC (const float model, const float rand, size_t sm, size_t sr, const double step)
Point2D< float >	getEllipseFromCov (const Image< double > &cov)
	Convert from a covariance matrix to the major/minor axis of an ellipse.

Detailed Description

Miscellaneous math functions

Definition in file MathFunctions.C.

Function Documentation

double expdev ( int & idum )

Randomly distributed Exponential deviate.

Definition at line 204 of file MathFunctions.C.

References log(), and ran2().

double gasdev ( int & idum )

Randomly distributed Gaussian deviate with zero mean and unit variance.

Definition at line 181 of file MathFunctions.C.

References log(), ran2(), and sqrt().

Point2D<float> getEllipseFromCov ( const Image< double > & cov )

Convert from a covariance matrix to the major/minor axis of an ellipse.

Definition at line 295 of file MathFunctions.C.

References ASSERT, Image< T >::getHeight(), Image< T >::getVal(), Image< T >::getWidth(), sqrt(), and trace().

int getIdum ( const bool useRandom = true )

Get a random seed for ran2.

If useRandom is true, a random negative number will be return, otherwise a negative number that is always the same will be returned.

Definition at line 172 of file MathFunctions.C.

void initRandomNumbers ( )

Initialize random seeds from pseudo-random sources (e.g. time(), getpid()).

Definition at line 68 of file MathFunctions.C.

Referenced by BeeStemSim::BeeStemSim(), main(), ModelManager::paramChanged(), SceneGenerator::SceneGenerator(), Staircase::start2(), ObjRec::start2(), and submain().

void initRandomNumbersZero ( )

Initialize random seeds with zero, to produce deterministic pseudo-random sequences.

Definition at line 77 of file MathFunctions.C.

Referenced by ModelManager::paramChanged().

bool isFinite ( const double & arg )