desmoj.core.dist

Class LinearCongruentialRandomGenerator

java.lang.Object

desmoj.core.dist.LinearCongruentialRandomGenerator

All Implemented Interfaces:

UniformRandomGenerator

public class LinearCongruentialRandomGenerator
extends java.lang.Object
implements UniformRandomGenerator

Linear congruential random generator for uniformly distributed pseudo random numbers configured such that a stream of [0,1] double values is produced. Implements the desmoj.dist.UniformRandomGenerator interface. All Distributions in this package use this random generator by default. The implementation is based on the Java API java.util.Random class' random generator. The Java API Random class uses a 48-bit seed as input to the linear congruential formula. (See Donald Knuth, The Art of Computer Programming, Volume 2, Section 3.2.1.)

Version:

DESMO-J, Ver. 2.5.1c copyright (c) 2015

Author:

Tim Lechler Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

See Also:

UniformRandomGenerator, Distribution, Random

Constructor Summary

Constructors

Constructor and Description
LinearCongruentialRandomGenerator() Creates a DefaultrandomGenerator with seed 42.
LinearCongruentialRandomGenerator(long seed) Creates a DefaultrandomGenerator with given value as initial seed.

Method Summary

Modifier and Type	Method and Description
double	nextDouble() Returns the next pseudo random uniform [0,1] distributed double value from the stream produced by the underlying pseudo random number generator.
void	setSeed(long newSeed) Sets the seed for the pseudo random number generator.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LinearCongruentialRandomGenerator

public LinearCongruentialRandomGenerator()

Creates a DefaultrandomGenerator with seed 42. The value 42 has been taken by pure coincidence. It is not really related to Douglas Adams' "Hitchhikers Guide to the Galaxy" trilogy of five books (so far).

LinearCongruentialRandomGenerator

public LinearCongruentialRandomGenerator(long seed)

Creates a DefaultrandomGenerator with given value as initial seed.

Parameters:

seed - long : The initial seed of the underlying pseudo random generator

Method Detail

nextDouble

public double nextDouble()

Returns the next pseudo random uniform [0,1] distributed double value from the stream produced by the underlying pseudo random number generator.

Specified by:

nextDouble in interface UniformRandomGenerator

Returns:

double : The next pseudo random uniform [0,1] distributed double value

setSeed

public void setSeed(long newSeed)

Sets the seed for the pseudo random number generator.

Specified by:

setSeed in interface UniformRandomGenerator

Parameters:

newSeed - long : The new initial seed value for the pseudo random number generator