RandomnessBasicseditdelete

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gsl-random – doesn't build with recent vector

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random-fu (Hackage)

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Summary

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A powerful library with:

random numbers/variables
list shuffling and random choice
various probability distributions
cumulative distribution functions
a monadic interface

Can use different randomness sources (/dev/random and /dev/urandom, StdGen, the Mersenne twister generator).

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Pros

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Supports different distributions.
Provides a monadic interface.

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Can be harder to use than other, simpler libraries.

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Ecosystem

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ks-test (Kolmogorov distribution), random-extras (weighted shuffling and sampling, card shuffling, etc)

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random (Hackage)

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The default random generator library. Simple to use, doesn't have many features.

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Convinient to use

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Very slow

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random-derive (automatically derive instances of Random)

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MonadRandom (Hackage)

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mwc-random (Hackage)

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Very fast!

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Less convinient to use than System.Random as it operates on top of PrimMonad (ie. you need IO or ST to use it). No pure interface available.

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tf-random (Hackage)

other

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cryptonite (Hackage)

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A collection of cryptography-related functions; listed here because it implements ChaCha, a cryptographically secure (CSPRNG) random number generator.

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Cryptographically secure.

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Low-level; only knows how to generate random bytes, not ints or strings.
The package takes long to build and the random number generator is only a small part of it.

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pcg-random (Hackage)

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An implementation of the PCG family of generators.

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Claimed to be faster than the Mersenne twister, and harder to predict (Mersenne twister can be predicted after just 624 outputs).

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mersenne-random-pure64 (Hackage)

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