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Parallel Colt is a multithreaded version of Colt - a library for high performance scientific computing in Java. It contains efficient algorithms for data analysis, linear algebra, multi-dimensional arrays, Fourier transforms, statistics and histogramming.

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/*
Copyright (C) 1999 CERN - European Organization for Nuclear Research.
Permission to use, copy, modify, distribute and sell this software and its documentation for any purpose 
is hereby granted without fee, provided that the above copyright notice appear in all copies and 
that both that copyright notice and this permission notice appear in supporting documentation. 
CERN makes no representations about the suitability of this software for any purpose. 
It is provided "as is" without expressed or implied warranty.
 */
package cern.jet.random.tdouble.engine;

import java.util.Date;

/**
 * Same as MersenneTwister except that method raw() returns 64
 * bit random numbers instead of 32 bit random numbers.
 * 
 * @author [email protected]
 * @version 1.0, 09/24/99
 * @see DoubleMersenneTwister
 */
public class MersenneTwister64 extends DoubleMersenneTwister {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    /**
     * Constructs and returns a random number generator with a default seed,
     * which is a constant.
     */
    public MersenneTwister64() {
        super();
    }

    /**
     * Constructs and returns a random number generator with the given seed.
     * 
     * @param seed
     *            should not be 0, in such a case
     *            MersenneTwister64.DEFAULT_SEED is silently
     *            substituted.
     */
    public MersenneTwister64(int seed) {
        super(seed);
    }

    /**
     * Constructs and returns a random number generator seeded with the given
     * date.
     * 
     * @param d
     *            typically new java.util.Date()
     */
    public MersenneTwister64(Date d) {
        super(d);
    }

    /**
     * Returns a 64 bit uniformly distributed random number in the open unit
     * interval (0.0,1.0) (excluding 0.0 and 1.0).
     */

    public double raw() {
        return nextDouble();
    }
}