Class XorShift1024StarRandom
- java.lang.Object
-
- java.util.Random
-
- it.unimi.dsi.util.XorShift1024StarRandom
-
- All Implemented Interfaces:
java.io.Serializable
@Deprecated public class XorShift1024StarRandom extends java.util.Random
Deprecated.Please useXorShift1024StarPhiRandom
instead.A fast, high-quality pseudorandom number generator that combines a long-period instance of George Marsaglia's Xorshift generators (described in “Xorshift RNGs”, Journal of Statistical Software, 8:1−6, 2003) with a multiplication.Warning: before release 2.6.3, the
split()
method would not alter the state of the caller, and it would return instances initialized in the same way if called multiple times. This was a major mistake in the implementation and it has been fixed, but as a consequence the output of the caller after a call tosplit()
is now different, and the result ofsplit()
is initialized in a different way.- See Also:
it.unimi.dsi.util
,Random
, Serialized Form
-
-
Constructor Summary
Constructors Constructor Description XorShift1024StarRandom()
Deprecated.Creates a new generator seeded usingUtil.randomSeed()
.XorShift1024StarRandom(long seed)
Deprecated.Creates a new generator using a given seed.
-
Method Summary
All Methods Instance Methods Concrete Methods Deprecated Methods Modifier and Type Method Description void
jump()
Deprecated.The jump function for this generator.protected int
next(int bits)
Deprecated.boolean
nextBoolean()
Deprecated.void
nextBytes(byte[] bytes)
Deprecated.double
nextDouble()
Deprecated.float
nextFloat()
Deprecated.int
nextInt()
Deprecated.int
nextInt(int n)
Deprecated.long
nextLong()
Deprecated.long
nextLong(long n)
Deprecated.Returns a pseudorandom uniformly distributedlong
value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.void
setSeed(long seed)
Deprecated.Sets the seed of this generator.void
setState(long[] state, int p)
Deprecated.Sets the state of this generator.XorShift1024StarRandom
split()
Deprecated.Returns a new instance that shares no mutable state with this instance.
-
-
-
Constructor Detail
-
XorShift1024StarRandom
public XorShift1024StarRandom()
Deprecated.Creates a new generator seeded usingUtil.randomSeed()
.
-
XorShift1024StarRandom
public XorShift1024StarRandom(long seed)
Deprecated.Creates a new generator using a given seed.- Parameters:
seed
- a seed for the generator.
-
-
Method Detail
-
next
protected int next(int bits)
Deprecated.- Overrides:
next
in classjava.util.Random
-
nextLong
public long nextLong()
Deprecated.- Overrides:
nextLong
in classjava.util.Random
-
nextInt
public int nextInt()
Deprecated.- Overrides:
nextInt
in classjava.util.Random
-
nextInt
public int nextInt(int n)
Deprecated.- Overrides:
nextInt
in classjava.util.Random
-
nextLong
public long nextLong(long n)
Deprecated.Returns a pseudorandom uniformly distributedlong
value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence. The algorithm used to generate the value guarantees that the result is uniform, provided that the sequence of 64-bit values produced by this generator is.- Parameters:
n
- the positive bound on the random number to be returned.- Returns:
- the next pseudorandom
long
value between0
(inclusive) andn
(exclusive).
-
nextDouble
public double nextDouble()
Deprecated.- Overrides:
nextDouble
in classjava.util.Random
-
nextFloat
public float nextFloat()
Deprecated.- Overrides:
nextFloat
in classjava.util.Random
-
nextBoolean
public boolean nextBoolean()
Deprecated.- Overrides:
nextBoolean
in classjava.util.Random
-
nextBytes
public void nextBytes(byte[] bytes)
Deprecated.- Overrides:
nextBytes
in classjava.util.Random
-
jump
public void jump()
Deprecated.The jump function for this generator. It is equivalent to 2512 calls tonextLong()
; it can be used to generate 2512 non-overlapping subsequences for parallel computations.
-
split
public XorShift1024StarRandom split()
Deprecated.Returns a new instance that shares no mutable state with this instance. The sequence generated by the new instance depends deterministically from the state of this instance, but the probability that the sequence generated by this instance and by the new instance overlap is negligible.Warning: before release 2.6.3, this method would not alter the state of the caller, and it would return instances initialized in the same way if called multiple times. This was a major mistake in the implementation and it has been fixed, but as a consequence the output of this instance after a call to this method is now different, and the returned instance is initialized in a different way.
- Returns:
- the new instance.
-
setSeed
public void setSeed(long seed)
Deprecated.Sets the seed of this generator.The argument will be used to seed a
SplitMix64RandomGenerator
, whose output will in turn be used to seed this generator. This approach makes “warmup” unnecessary, and makes the probability of starting from a state with a large fraction of bits set to zero astronomically small.- Overrides:
setSeed
in classjava.util.Random
- Parameters:
seed
- a seed for this generator.
-
setState
public void setState(long[] state, int p)
Deprecated.Sets the state of this generator.The internal state of the generator will be reset, and the state array filled with the provided array.
- Parameters:
state
- an array of 16 longs; at least one must be nonzero.p
- the internal index.
-
-