org.jgap.impl

Class CauchyRandomGenerator

java.lang.Object

org.jgap.impl.CauchyRandomGenerator

All Implemented Interfaces:

java.io.Serializable, RandomGenerator

public class CauchyRandomGenerator
extends java.lang.Object
implements RandomGenerator

Cauchy probability density function (cumulative distribution function).

Since:

1.1

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
CauchyRandomGenerator() Defaults to location = 0.0 and scale = 1.0.
CauchyRandomGenerator(double a_location, double a_scale)

Method Summary

Modifier and Type	Method and Description
double	getCauchyStandardDeviation()
boolean	nextBoolean() Returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence.
double	nextCauchy() Calculate Cumulative Cauchy distribution function.
double	nextDouble() Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.
float	nextFloat() Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence.
int	nextInt() Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence.
int	nextInt(int a_ceiling) Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.
long	nextLong() Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CauchyRandomGenerator

public CauchyRandomGenerator()

Defaults to location = 0.0 and scale = 1.0.

Since:

1.1

CauchyRandomGenerator

public CauchyRandomGenerator(double a_location,
                             double a_scale)

Parameters:

a_location - cauchy parameter, 0 is standard

a_scale - cauchy parameter, 1 is standard

Since:

1.1

Method Detail

nextInt

public int nextInt()

Description copied from interface: RandomGenerator

Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence. The general contract of nextInt is that one int value is pseudorandomly generated and returned. All 2^32 possible int values are produced with (approximately) equal probability.

Specified by:

nextInt in interface RandomGenerator

Returns:

a pseudorandom integer value

nextInt

public int nextInt(int a_ceiling)

Description copied from interface: RandomGenerator

Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence. The general contract of nextInt is that one int value in the specified range is pseudorandomly generated and returned. All n possible int values are produced with (approximately) equal probability.

Specified by:

nextInt in interface RandomGenerator

Parameters:

a_ceiling - the upper boundary excluded

Returns:

a pseudorandom integer value between 0 and the given ceiling - 1, inclusive

nextLong

public long nextLong()

Description copied from interface: RandomGenerator

Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence. The general contract of nextLong() is that one long value is pseudorandomly generated and returned. All 2^64 possible long values are produced with (approximately) equal probability.

Specified by:

nextLong in interface RandomGenerator

Returns:

a psuedorandom long value

nextDouble

public double nextDouble()

Description copied from interface: RandomGenerator

Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.

Specified by:

nextDouble in interface RandomGenerator

Returns:

a psuedorandom double value GREATER/EQUAL 0 AND LESS THAN 1

nextFloat

public float nextFloat()

Description copied from interface: RandomGenerator

Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence.

Specified by:

nextFloat in interface RandomGenerator

Returns:

a psuedorandom float value

nextBoolean

public boolean nextBoolean()

Description copied from interface: RandomGenerator

Returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence. The general contract of nextBoolean is that one boolean value is pseudorandomly generated and returned. The values true and false are produced with (approximately) equal probability.

Specified by:

nextBoolean in interface RandomGenerator

Returns:

a pseudorandom boolean value

nextCauchy

public double nextCauchy()

Calculate Cumulative Cauchy distribution function.

Returns:

the probability that a stochastic variable x is less than X

Since:

1.1

getCauchyStandardDeviation

public double getCauchyStandardDeviation()

Returns:

the cauchy standard deviation

Since:

1.1