Class MersenneTwister64
java.lang.Object
org.apache.commons.rng.core.BaseProvider
org.apache.commons.rng.core.source64.LongProvider
org.apache.commons.rng.core.source64.MersenneTwister64
- All Implemented Interfaces:
RandomLongSource
,RestorableUniformRandomProvider
,UniformRandomProvider
This class provides the 64-bits version of the originally 32-bits
Mersenne Twister
.
This class is mainly a Java port of the 2014/2/23 version of the generator written in C by Takuji Nishimura and Makoto Matsumoto.
Here is their original copyright:
Copyright (C) 2004, Makoto Matsumoto and Takuji Nishimura, All rights reserved. |
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
- Since:
- 1.0
- See Also:
-
Field Summary
FieldsModifier and TypeFieldDescriptionprivate static final long
Least significant 31 bits.private static final long[]
X * MATRIX_A for X = {0, 1}.private static final int
Period second parameter.private final long[]
Bytes pool.private int
Current index in the bytes pool.private static final int
Size of the bytes pool.private static final long
Most significant 33 bits. -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprotected byte[]
Creates a snapshot of the RNG state.private void
initState
(long seed) Initialize the internal state of this instance.long
next()
Return the next random value.private void
setSeedInternal
(long[] inputSeed) Initializes the generator with the given seed.protected void
setStateInternal
(byte[] s) Resets the RNG to the givenstate
.Methods inherited from class org.apache.commons.rng.core.source64.LongProvider
nextBoolean, nextInt, nextLong, resetCachedState
Methods inherited from class org.apache.commons.rng.core.BaseProvider
checkIndex, checkStateSize, composeStateInternal, extendSeed, extendSeed, fillState, fillState, restoreState, saveState, splitStateInternal, toString
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Field Details
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NN
private static final int NNSize of the bytes pool.- See Also:
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MM
private static final int MMPeriod second parameter.- See Also:
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MAG01
private static final long[] MAG01X * MATRIX_A for X = {0, 1}. -
UM
private static final long UMMost significant 33 bits.- See Also:
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LM
private static final long LMLeast significant 31 bits.- See Also:
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mt
private final long[] mtBytes pool. -
mti
private int mtiCurrent index in the bytes pool.
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Constructor Details
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MersenneTwister64
public MersenneTwister64(long[] seed) Creates a new random number generator.- Parameters:
seed
- Initial seed.
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Method Details
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getStateInternal
protected byte[] getStateInternal()Creates a snapshot of the RNG state.- Overrides:
getStateInternal
in classLongProvider
- Returns:
- the internal state.
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setStateInternal
protected void setStateInternal(byte[] s) Resets the RNG to the givenstate
.- Overrides:
setStateInternal
in classLongProvider
- Parameters:
s
- State (previously obtained by a call toBaseProvider.getStateInternal()
).- See Also:
-
setSeedInternal
private void setSeedInternal(long[] inputSeed) Initializes the generator with the given seed.- Parameters:
inputSeed
- Initial seed.
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initState
private void initState(long seed) Initialize the internal state of this instance.- Parameters:
seed
- Seed.
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next
public long next()Return the next random value.- Returns:
- the next random value.
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