程序包 org.hipparchus.random

类 Well512a

java.lang.Object

org.hipparchus.random.AbstractWell

org.hipparchus.random.Well512a

所有已实现的接口:

Serializable, RandomGenerator

       public class Well512a extends AbstractWell
      

This class implements the WELL512a pseudo-random number generator from François Panneton, Pierre L'Ecuyer and Makoto Matsumoto.

This generator is described in a paper by François Panneton, Pierre L'Ecuyer and Makoto Matsumoto Improved Long-Period Generators Based on Linear Recurrences Modulo 2 ACM Transactions on Mathematical Software, 32, 1 (2006). The errata for the paper are in wellrng-errata.txt.

另请参阅:

• WELL随机数生成器
• 序列化表格

嵌套类概要

从类继承的嵌套类/接口 org.hipparchus.random.AbstractWell

AbstractWell.IndexTable

字段概要

从类继承的字段 org.hipparchus.random.AbstractWell

index, v

构造器概要

构造器

构造器	说明
Well512a()	Creates a new random number generator.
Well512a(int seed)	Creates a new random number generator using a single int seed.
Well512a(int[] seed)	Creates a new random number generator using an int array seed.
Well512a(long seed)	Creates a new random number generator using a single long seed.

方法概要

修饰符和类型	方法	说明
protected void	clearCache()	Clears the cache used by the default implementation of RandomGenerator.nextGaussian().
boolean	nextBoolean()	Returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence.
void	nextBytes(byte[] bytes)	Generates random bytes and places them into a user-supplied byte array.
void	nextBytes(byte[] bytes, int start, int len)	Generates random bytes and places them into a user-supplied byte array.
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.
double	nextGaussian()	Returns the next pseudorandom, Gaussian ("normally") distributed double value with mean 0.0 and standard deviation 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 n)	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.
long	nextLong(long n)	Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.
void	setSeed(int seed)	Sets the seed of the underlying random number generator using an int seed.
void	setSeed(long seed)	Sets the seed of the underlying random number generator using a long seed.
String	toString()

从类继承的方法 org.hipparchus.random.AbstractWell

setSeed

从类继承的方法 java.lang.Object

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

构造器详细资料

Well512a

             public Well512a()
            

Creates a new random number generator.

The instance is initialized using the current time as the seed.

Well512a

             public Well512a(int seed)
            

Creates a new random number generator using a single int seed.

参数:

seed - the initial seed (32 bits integer)

Well512a

             public Well512a(int[] seed)
            

Creates a new random number generator using an int array seed.

参数:

seed - the initial seed (32 bits integers array), if null the seed of the generator will be related to the current time

Well512a

             public Well512a(long seed)
            

Creates a new random number generator using a single long seed.

参数:

seed - the initial seed (64 bits integer)

方法详细资料

nextInt

             public int nextInt()
            

Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence.

All 2³² possible int values should be produced with (approximately) equal probability.

指定者:

nextInt 在接口中 RandomGenerator

返回:

the next pseudorandom, uniformly distributed int value from this random number generator's sequence

nextBoolean

             public boolean nextBoolean()
            

Returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence.

返回:

the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence

nextDouble

             public double nextDouble()
            

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

返回:

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

nextFloat

             public float nextFloat()
            

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

返回:

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

nextLong

             public long nextLong()
            

Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence. All 2⁶⁴ possible long values should be produced with (approximately) equal probability.

返回:

the next pseudorandom, uniformly distributed long value from this random number generator's sequence

nextBytes

             public void nextBytes(byte[] bytes)
            

Generates random bytes and places them into a user-supplied byte array. The number of random bytes produced is equal to the length of the byte array.

参数:

bytes - the non-null byte array in which to put the random bytes

nextBytes

             public void nextBytes(byte[] bytes, int start, int len)
            

Generates random bytes and places them into a user-supplied byte array.

参数:

bytes - the non-null byte array in which to put the random bytes

start - the starting index for inserting the generated bytes into the array

len - the number of bytes to generate

setSeed

             public void setSeed(int seed)
            

Sets the seed of the underlying random number generator using an int seed.

Sequences of values generated starting with the same seeds should be identical.

指定者:

setSeed 在接口中 RandomGenerator

参数:

seed - the seed value

setSeed

             public void setSeed(long seed)
            

Sets the seed of the underlying random number generator using a long seed.

Sequences of values generated starting with the same seeds should be identical.

指定者:

setSeed 在接口中 RandomGenerator

参数:

seed - the seed value

nextInt

             public int nextInt(int n) throws IllegalArgumentException
            

Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.

指定者:

nextInt 在接口中 RandomGenerator

参数:

n - 要返回的随机数的上限。必须是正数。

返回:

一个伪随机、均匀分布的int值，介于0（包括）和n（不包括）之间。

抛出:

IllegalArgumentException - 如果n不是正数。

nextLong

             public long nextLong(long n)
            

返回一个伪随机、均匀分布的int值，介于0（包括）和指定值（不包括）之间，从此随机数生成器的序列中抽取。

指定者:

nextLong 在接口中 RandomGenerator

参数:

n - 要返回的随机数的上限。必须是正数。

返回:

一个伪随机、均匀分布的int值，介于0（包括）和n（不包括）之间。

nextGaussian

             public double nextGaussian()
            

返回下一个伪随机、高斯（“正态”）分布的double值，均值为0.0，标准差为1.0，从此随机数生成器的序列中。

指定者:

nextGaussian 在接口中 RandomGenerator

返回:

下一个伪随机、高斯（“正态”）分布的double值，均值为0.0，标准差为1.0，从此随机数生成器的序列中。

clearCache

             protected void clearCache()
            

清除默认实现中使用的缓存RandomGenerator.nextGaussian()。

toString

             public String toString()
            

覆盖:

toString 在类中 Object