Module

Random.LCG

#Seed 

newtype Seed

A seed for the linear congruential generator. We omit a Semiring instance because there is no zero value, as 0 is not an acceptable seed for the generator.

Instances

#mkSeed 

mkSeed :: Int -> Seed

#unSeed 

unSeed :: Seed -> Int

#randomSeed 

randomSeed :: Effect Seed

Create a random seed

#lcgA 

lcgA :: Int

The multiplier: a magic constant for the linear congruential generator

#lcgC 

lcgC :: Int

The increment: a magic constant for the linear congruential generator

#lcgM 

lcgM :: Int

The modulus: a magic constant for the linear congruential generator. It is equal to 2^31 - 1, a Mersenne prime. It is useful for this value to be prime, because then the requirement of the initial seed being coprime to the modulus is satisfied when the seed is between 1 and lcgM - 1.

#lcgNext 

lcgNext :: Seed -> Seed

Step the linear congruential generator

#lcgPerturb 

lcgPerturb :: Int -> Seed -> Seed

Perturb a seed value

Modules