cern.jet.random.engine
Class DRand
java.lang.Object
|
+--cern.colt.PersistentObject
|
+--cern.jet.random.engine.RandomEngine
|
+--cern.jet.random.engine.DRand
- All Implemented Interfaces:
- Cloneable, DoubleFunction, IntFunction, Serializable
- public class DRand
- extends RandomEngine
Quick medium quality uniform pseudo-random number generator.
Produces uniformly distributed int's and long's in the closed intervals [Integer.MIN_VALUE,Integer.MAX_VALUE] and [Long.MIN_VALUE,Long.MAX_VALUE], respectively,
as well as float's and double's in the open unit intervals (0.0f,1.0f) and (0.0,1.0), respectively.
The seed can be any integer satisfying 0 < 4*seed+1 < 232.
In other words, there must hold seed >= 0 && seed < 1073741823.
Quality: This generator follows the multiplicative congruential method of the form
z(i+1) = a * z(i) (mod m) with
a=663608941 (=0X278DDE6DL), m=232.
z(i) assumes all different values 0 < 4*seed+1 < m during a full period of 230.
Performance: TO_DO
Implementation: TO_DO
Note that this implementation is not synchronized.
- Version:
- 1.0, 09/24/99
- See Also:
MersenneTwister
,
Random
, Serialized Form
Constructor Summary |
DRand()
Constructs and returns a random number generator with a default seed, which is a constant. |
DRand(Date d)
Constructs and returns a random number generator seeded with the given date. |
DRand(int seed)
Constructs and returns a random number generator with the given seed. |
Method Summary |
int |
nextInt()
Returns a 32 bit uniformly distributed random number in the closed interval [Integer.MIN_VALUE,Integer.MAX_VALUE] (including Integer.MIN_VALUE and Integer.MAX_VALUE). |
DEFAULT_SEED
public static final int DEFAULT_SEED
DRand
public DRand()
- Constructs and returns a random number generator with a default seed, which is a constant.
DRand
public DRand(int seed)
- Constructs and returns a random number generator with the given seed.
- Parameters:
seed
- should not be 0, in such a case DRand.DEFAULT_SEED is substituted.
DRand
public DRand(Date d)
- Constructs and returns a random number generator seeded with the given date.
- Parameters:
d
- typically new java.util.Date()
nextInt
public int nextInt()
- Returns a 32 bit uniformly distributed random number in the closed interval [Integer.MIN_VALUE,Integer.MAX_VALUE] (including Integer.MIN_VALUE and Integer.MAX_VALUE).
- Overrides:
nextInt
in class RandomEngine
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