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## 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

Field Summary
`static int` | `DEFAULT_SEED`

Fields inherited from class cern.colt.PersistentObject
`serialVersionUID`

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`).

Methods inherited from class cern.jet.random.engine.RandomEngine
`apply, apply, makeDefault, nextDouble, nextFloat, nextLong, raw`

Methods inherited from class cern.colt.PersistentObject
`clone`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### DEFAULT_SEED

    public static final int DEFAULT_SEED

See Also:
  Constant Field Values

Constructor Detail

### 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()`

Method Detail

### 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`).

  Specified by:
    `nextInt` in class `RandomEngine`

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