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Title: Algorithms/Pseudorandom Numbers - RngPack A pseudorandom number generator package for Java. Source code free under BSD licence.
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RngPack: High-Quality Random Numbers for Java

RngPack 1.1a

Nov 6, 2003 -- RngPack 1.1 released

RngPack 1.1a fixes a number of serious bugs in RngPack 1.0 including anincorrect coefficient in the Ranecu implementation and an off-by-oneerror in the choice() method. RngPack 1.1a supports Java serialization,adds a coin() method to get true/false coin tosses, adds a synchronizedwrapper and includes a new generator, the Mersenne Twister. All RngPackusers should upgrade to RngPack 1.1a. RngPack 1.1a is now available undera BSD License. See the Changelog, java class documentation, or download source code in tar.gzor zip format.

What is RngPack?

RngPack is a pseudorandom number generator package for Java. Pseudorandommeans that the "random" numbers are generated by a deterministicmathematical process, not by a fundamentally random physical processsuch as radioactive decay or Johnson noise. RngPack containsbase classes that add value to random number generators, four researchgrade generators, as well as a wrapper for Java's built in randomnumber generator and a demonstration application. RngPackcomes with java class documentation. Because RngPack is a set of Java classesit can be usedin both applications and in applets. RngPack is available under theBSD License.

What is RngPack good for?

RngPack is good for Research applications: the RANLUX, RANMAR,RANECU and the Mersenne Twister generators are strong generators used forresearch applications where billions and billions of numbers withlow statistical correlations are required. Theoretical studies andpractical tests have been made on all four generators, and all generatorshave a history of use in research.All four generators are portable; given a particular seed, theygenerate the same numbers on every machine and produce the same numbers asFORTRAN implementations. The four research-grade generators allwork with Java Object Serialization. Entertainment/Industrial applications: most of our generators runfaster than Math.random() in our tests. BecauseRngPack is object-oriented and easy to use, it may be of interest topeople who want smaller numbers of moderate quality numbers.

What isn't RngPack good for?

RngPack is not reccomended for Security/Cryptography applications: The generators in RngPack weredesigned to have no statistical correlations that would affect large-scale simulations. They were not designed to be inscrutable to amathematically inclined codebreaker. I don't reccomend that you useRngPack or Math.random() for cryptography -- instead youshould use algorithms that were designed and tested specifically forthat purpose. JDK 1.1 contains a secure random number generatordesigned for cryptography. Probably the best method of key generationavailable today is the /dev/random device built into Linux, Solaris andsome other operating systems.

Comparison of generators

(Time is time to generate 10,000,000 numbers on a 300 Mhz Linux computerrunning the Sun JDK 1.4.2_02)NamePeriodTime (no JIT / JIT)Special propertiesRanlux1017114.7 sRANLUX allows the user to adjust the "luxury level"from 0 to 4 to trade speed for quality. At levels 3 and 4RANLUX is a large advance in quality over previous generatorsRanmar1043 4.2 s Each RANMAR seed within it's range produces a unique sequence;by splitting up the seed space, collaborating researchers can ensure thatthey produce sequences that do not overlap.Ranecu10185.8 sRANECU is an advanced multiplicative linear congruentialgenerator.RanMT219937-17.1 sThe Mersenne twister has an exceptionally long period and is known tobe well-distributed in 632-dimensional lag space.RandomJava?8.0 sRandomJava wraps up the Math.random() method that comeswith Java. Not reccomended for general use.

Download

Download RngPack 1.1 asource code as agzip-tar file or as aZIP file.RngPack is free under a BSD Licence. If you use RngPack in a project, pleasesend me an E-mail so I can send you news of updates. I'dbe interested in working with anyone who is interested in improving thecode and incorporating the improvements into future versions. addthis_url = location.href; addthis_title = document.title; addthis_pub = 'devonianfarm'; 
 

A

pseudorandom

number

generator

package

for

Java.

Source

code

free

under

BSD

licence.

http://www.honeylocust.com/RngPack/

RngPack 2008 October

dvd rental

dvd


A pseudorandom number generator package for Java. Source code free under BSD licence.

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