System.Random.Xorshift128Plus

This module is implementation of xorshift128+ random number generator. Read original implementation and description is strictly recommended.

The generator state is stored in the Gen data type and it is created by initialize function with seed value or calling Gen data constructor with generator state.

To generate random values, first initialize a random number generator by seed value.

  let gen = initialize 3748374974327

Then generate a random number by next or next01.

  let (v, gen') = next gen

  let (v, gen') = next01 gen

Documentation

data Gen

Random number generator.

Constructors

Gen !Word64 !Word64

Instances

Eq Gen

Show Gen

initialize :: Word64 -> Gen

Create a generator by seed value. Please do not supply 0.

next :: Gen -> (Word64, Gen)

Generate a 64bit random value and next generator state.

next01 :: Gen -> (Double, Gen)

Generate a random value between 0 and 1. And next generator state.

next# :: Gen -> (#Word64, Gen#)

Same as next, but return values with unboxed tuple.