Package cern.jet.random

Class Uniform

java.lang.Object

cern.colt.PersistentObject

cern.jet.random.AbstractDistribution

cern.jet.random.AbstractContinousDistribution

cern.jet.random.Uniform

All Implemented Interfaces:

DoubleFunction, IntFunction, Serializable, Cloneable

public class Uniform
extends AbstractContinousDistribution

Uniform distribution; Math definition and animated definition.

Instance methods operate on a user supplied uniform random number generator; they are unsynchronized.

Static methods operate on a default uniform random number generator; they are synchronized.

Version:

1.0, 09/24/99

Author:

wolfgang.hoschek@cern.ch

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected double	max
protected double	min
protected static Uniform	shared

Fields inherited from class cern.jet.random.AbstractDistribution

randomGenerator

Constructor Summary

Constructors

Constructor	Description
Uniform(double min, double max, int seed)	Constructs a uniform distribution with the given minimum and maximum, using a MersenneTwister seeded with the given seed.
Uniform(double min, double max, RandomEngine randomGenerator)	Constructs a uniform distribution with the given minimum and maximum.
Uniform(RandomEngine randomGenerator)	Constructs a uniform distribution with min=0.0 and max=1.0.

Method Summary

Modifier and Type	Method	Description
double	cdf(double x)	Returns the cumulative distribution function (assuming a continous uniform distribution).
boolean	nextBoolean()	Returns a uniformly distributed random boolean.
double	nextDouble()	Returns a uniformly distributed random number in the open interval (min,max) (excluding min and max).
double	nextDoubleFromTo(double from, double to)	Returns a uniformly distributed random number in the open interval (from,to) (excluding from and to).
float	nextFloatFromTo(float from, float to)	Returns a uniformly distributed random number in the open interval (from,to) (excluding from and to).
int	nextInt()	Returns a uniformly distributed random number in the closed interval [min,max] (including min and max).
int	nextIntFromTo(int from, int to)	Returns a uniformly distributed random number in the closed interval [from,to] (including from and to).
long	nextLongFromTo(long from, long to)	Returns a uniformly distributed random number in the closed interval [from,to] (including from and to).
double	pdf(double x)	Returns the probability distribution function (assuming a continous uniform distribution).
void	setState(double min, double max)	Sets the internal state.
static boolean	staticNextBoolean()	Returns a uniformly distributed random boolean.
static double	staticNextDouble()	Returns a uniformly distributed random number in the open interval (0,1) (excluding 0 and 1).
static double	staticNextDoubleFromTo(double from, double to)	Returns a uniformly distributed random number in the open interval (from,to) (excluding from and to).
static float	staticNextFloatFromTo(float from, float to)	Returns a uniformly distributed random number in the open interval (from,to) (excluding from and to).
static int	staticNextIntFromTo(int from, int to)	Returns a uniformly distributed random number in the closed interval [from,to] (including from and to).
static long	staticNextLongFromTo(long from, long to)	Returns a uniformly distributed random number in the closed interval [from,to] (including from and to).
static void	staticSetRandomEngine(RandomEngine randomGenerator)	Sets the uniform random number generation engine shared by all static methods.
String	toString()	Returns a String representation of the receiver.

Methods inherited from class cern.jet.random.AbstractDistribution

apply, apply, clone, getRandomGenerator, makeDefaultGenerator, setRandomGenerator

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

min

protected double min

max

protected double max

shared

protected static Uniform shared

Constructor Details

Uniform

public Uniform(double min,
 double max,
 int seed)

Constructs a uniform distribution with the given minimum and maximum, using a MersenneTwister seeded with the given seed.

Uniform

public Uniform(double min,
 double max,
 RandomEngine randomGenerator)

Constructs a uniform distribution with the given minimum and maximum.

Uniform

public Uniform(RandomEngine randomGenerator)

Constructs a uniform distribution with min=0.0 and max=1.0.

Method Details

cdf

public double cdf(double x)

Returns the cumulative distribution function (assuming a continous uniform distribution).

nextBoolean

public boolean nextBoolean()

Returns a uniformly distributed random boolean.

nextDouble

public double nextDouble()

Returns a uniformly distributed random number in the open interval (min,max) (excluding min and max).

Specified by:

nextDouble in class AbstractDistribution

nextDoubleFromTo

public double nextDoubleFromTo(double from,
 double to)

Returns a uniformly distributed random number in the open interval (from,to) (excluding from and to). Pre conditions: from <= to.

nextFloatFromTo

public float nextFloatFromTo(float from,
 float to)

Returns a uniformly distributed random number in the open interval (from,to) (excluding from and to). Pre conditions: from <= to.

nextInt

public int nextInt()

Returns a uniformly distributed random number in the closed interval [min,max] (including min and max).

Overrides:

nextInt in class AbstractDistribution

nextIntFromTo

public int nextIntFromTo(int from,
 int to)

Returns a uniformly distributed random number in the closed interval [from,to] (including from and to). Pre conditions: from <= to.

nextLongFromTo

public long nextLongFromTo(long from,
 long to)

Returns a uniformly distributed random number in the closed interval [from,to] (including from and to). Pre conditions: from <= to.

pdf

public double pdf(double x)

Returns the probability distribution function (assuming a continous uniform distribution).

setState

public void setState(double min,
 double max)

Sets the internal state.

staticNextBoolean

public static boolean staticNextBoolean()

Returns a uniformly distributed random boolean.

staticNextDouble

public static double staticNextDouble()

Returns a uniformly distributed random number in the open interval (0,1) (excluding 0 and 1).

staticNextDoubleFromTo

public static double staticNextDoubleFromTo(double from,
 double to)

Returns a uniformly distributed random number in the open interval (from,to) (excluding from and to). Pre conditions: from <= to.

staticNextFloatFromTo

public static float staticNextFloatFromTo(float from,
 float to)

Returns a uniformly distributed random number in the open interval (from,to) (excluding from and to). Pre conditions: from <= to.

staticNextIntFromTo

public static int staticNextIntFromTo(int from,
 int to)

Returns a uniformly distributed random number in the closed interval [from,to] (including from and to). Pre conditions: from <= to.

staticNextLongFromTo

public static long staticNextLongFromTo(long from,
 long to)

Returns a uniformly distributed random number in the closed interval [from,to] (including from and to). Pre conditions: from <= to.

staticSetRandomEngine

public static void staticSetRandomEngine(RandomEngine randomGenerator)

Sets the uniform random number generation engine shared by all static methods.

Parameters:

randomGenerator - the new uniform random number generation engine to be shared.

toString

public String toString()

Returns a String representation of the receiver.

Overrides:

toString in class Object