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GHC 9.10.3 · lts/ghc-9.10.x · 248f8f0 · 2026-10-05

Modulesplitmix-0.1.3.1Haskell2010

System.Random.SplitMix32

SplitMix is a splittable pseudorandom number generator (PRNG) that is quite fast.

This is 32bit variant (original one is 32 bit).

You really don't want to use this one.

  • 1 type
  • 18 values
  • Packagesplitmix-0.1.3.1
  • Exports19
  • LanguageHaskell2010
  • LicenceBSD-3-Clause
  • SourceSplitMix32.hs
datadata SMGen
#

SplitMix generator state.

Instances3Read, Show, NFData
  • Read SMGenDefined in splitmix-0.1.3.1 · System.Random.SplitMix32
    Example1 expression
    readMaybe "SMGen 1 1" :: Maybe SMGenJust (SMGen 1 1)
    Example1 expression
    readMaybe "SMGen 1 2" :: Maybe SMGenNothing
    Example1 expression
    readMaybe (show (mkSMGen 42)) :: Maybe SMGenJust (SMGen 142593372 1604540297)
  • Show SMGenDefined in splitmix-0.1.3.1 · System.Random.SplitMix32
  • NFData SMGenDefined in splitmix-0.1.3.1 · System.Random.SplitMix32
valuenextWord32 :: SMGen -> (Word32, SMGen)
#

Generate a Word32.

Example1 expression
take 3 $ map (printf "%x") $ unfoldr (Just . nextWord32) (mkSMGen 1337) :: [String]["e0cfe722","a6ced0f0","c3a6d889"]
valuenextDouble :: SMGen -> (Double, SMGen)
#

Generate a Double in [0, 1) range.

Example1 expression
take 8 $ map (printf "%0.3f") $ unfoldr (Just . nextDouble) (mkSMGen 1337) :: [String]["0.878","0.764","0.063","0.845","0.262","0.490","0.176","0.544"]
valuenextFloat :: SMGen -> (Float, SMGen)
#

Generate a Float in [0, 1) range.

Example1 expression
take 8 $ map (printf "%0.3f") $ unfoldr (Just . nextFloat) (mkSMGen 1337) :: [String]["0.878","0.652","0.764","0.631","0.063","0.180","0.845","0.645"]

Generation

4 declarations
valuebitmaskWithRejection64 :: Word64 -> SMGen -> (Word64, SMGen)
#

Bitmask with rejection method of generating subrange of Word64.

bitmaskWithRejection64 w64 generates random numbers in closed-open range of [0, w64).

Example1 expression
take 20 $ unfoldr (Just . bitmaskWithRejection64 5) (mkSMGen 1337)[0,2,4,2,1,4,2,4,2,2,3,0,3,2,2,2,3,1,2,2]
valuebitmaskWithRejection64' :: Word64 -> SMGen -> (Word64, SMGen)
#

Bitmask with rejection method of generating subrange of Word64.

bitmaskWithRejection64' w64 generates random numbers in closed-closed range of [0, w64].

Example1 expression
take 20 $ unfoldr (Just . bitmaskWithRejection64' 5) (mkSMGen 1337)[0,2,4,2,1,4,2,4,5,5,2,2,5,3,5,0,3,2,2,2]

Initialisation

6 declarations
valuemkSMGen :: Word32 -> SMGen
#

Preferred way to deterministically construct SMGen.

Example1 expression
mkSMGen 42SMGen 142593372 1604540297