Package smile.math.random
Class UniversalGenerator
- java.lang.Object
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- smile.math.random.UniversalGenerator
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- All Implemented Interfaces:
RandomNumberGenerator
public class UniversalGenerator extends java.lang.Object implements RandomNumberGenerator
The so called "Universal Generator" based on multiplicative congruential method, which originally appeared in "Toward a Universal Random Number Generator" by Marsaglia, Zaman and Tsang. It was later modified by F. James in "A Review of Pseudo-random Number Generators". It passes ALL of the tests for random number generators and has a period of 2144. It is completely portable (gives bit identical results on all machines with at least 24-bit mantissas in the floating point representation).- Author:
- Haifeng Li
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Constructor Summary
Constructors Constructor Description UniversalGenerator()
Initialize Random with default seed.UniversalGenerator(int seed)
Initialize Random with a specified integer seedUniversalGenerator(long seed)
Initialize Random with a specified long seed
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
next(int numbits)
Returns up to 32 random bits.double
nextDouble()
Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.void
nextDoubles(double[] d)
Returns a vector of pseudorandom, uniformly distributed double values 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 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.void
setSeed(long seed)
Initialize the random generator with a seed.
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Constructor Detail
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UniversalGenerator
public UniversalGenerator()
Initialize Random with default seed.
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UniversalGenerator
public UniversalGenerator(int seed)
Initialize Random with a specified integer seed
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UniversalGenerator
public UniversalGenerator(long seed)
Initialize Random with a specified long seed
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Method Detail
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setSeed
public void setSeed(long seed)
Description copied from interface:RandomNumberGenerator
Initialize the random generator with a seed.- Specified by:
setSeed
in interfaceRandomNumberGenerator
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nextDouble
public double nextDouble()
Description copied from interface:RandomNumberGenerator
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 interfaceRandomNumberGenerator
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nextDoubles
public void nextDoubles(double[] d)
Description copied from interface:RandomNumberGenerator
Returns a vector of pseudorandom, uniformly distributed double values between 0.0 and 1.0 from this random number generator's sequence.- Specified by:
nextDoubles
in interfaceRandomNumberGenerator
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next
public int next(int numbits)
Description copied from interface:RandomNumberGenerator
Returns up to 32 random bits.- Specified by:
next
in interfaceRandomNumberGenerator
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nextInt
public int nextInt()
Description copied from interface:RandomNumberGenerator
Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence.- Specified by:
nextInt
in interfaceRandomNumberGenerator
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nextInt
public int nextInt(int n)
Description copied from interface:RandomNumberGenerator
Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.- Specified by:
nextInt
in interfaceRandomNumberGenerator
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nextLong
public long nextLong()
Description copied from interface:RandomNumberGenerator
Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence.- Specified by:
nextLong
in interfaceRandomNumberGenerator
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