The mwc-random package

[Tags: bsd3, library]

This package contains code for generating high quality random numbers that follow either a uniform or normal distribution. The generated numbers are suitable for use in statistical applications.

The uniform PRNG uses Marsaglia's MWC256 (also known as MWC8222) multiply-with-carry generator, which has a period of 2^8222 and fares well in tests of randomness. It is also extremely fast, between 2 and 3 times faster than the Mersenne Twister.

Compared to the mersenne-random package, this package has a more convenient API, is faster, and supports more statistical distributions.

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Change logNone available
Dependenciesbase (<5), primitive (<0.6), time, vector (>=0.7) [details]
Copyright2009, 2010, 2011 Bryan O'Sullivan
AuthorBryan O'Sullivan <>
MaintainerBryan O'Sullivan <>
CategoryMath, Statistics
Home page
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Source repositoryhead: git clone git://
head: hg clone
UploadedWed Aug 15 18:45:46 UTC 2012 by BryanOSullivan
UpdatedMon Apr 6 16:54:48 UTC 2015 by AlexeyKhudyakov to revision 1
DistributionsDebian:, Fedora:, FreeBSD:, LTSHaskell:, NixOS:, Stackage:
Downloads61084 total (165 in last 30 days)
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StatusDocs uploaded by user
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Maintainers' corner

For package maintainers and hackage trustees

Readme for mwc-random-

Efficient, general purpose pseudo-random number generation

This package provides the System.Random.MWC module, a Haskell library for generating high-quality pseudo-random numbers in a space- and time-efficient way.

Get involved!

Please report bugs via the github issue tracker.

Master git git repository:

There's also a Mercurial mirror:

(You can create and contribute changes using either Mercurial or git.)


This library is written and maintained by Bryan O'Sullivan,