| Name : ghc-random
| |
| Version : 1.2.1.2
| Vendor : obs://build_opensuse_org/devel:languages:haskell
|
| Release : 1.40
| Date : 2024-02-04 17:26:32
|
| Group : Unspecified
| Source RPM : ghc-random-1.2.1.2-1.40.src.rpm
|
| Size : 0.86 MB
| |
| Packager : (none)
| |
| Summary : Pseudo-random number generation
|
Description :
This package provides basic pseudo-random number generation, including the
ability to split random number generators.
== \"System.Random\": pure pseudo-random number interface
In pure code, use \'System.Random.uniform\' and \'System.Random.uniformR\' from
\"System.Random\" to generate pseudo-random numbers with a pure pseudo-random
number generator like \'System.Random.StdGen\'.
As an example, here is how you can simulate rolls of a six-sided die using
\'System.Random.uniformR\':
>>> let roll = uniformR (1, 6) :: RandomGen g => g -> (Word, g) >>> let rolls =
unfoldr (Just . roll) :: RandomGen g => g -> [Word] >>> let pureGen = mkStdGen
42 >>> take 10 (rolls pureGen) :: [Word] [1,1,3,2,4,5,3,4,6,2]
See \"System.Random\" for more details.
== \"System.Random.Stateful\": monadic pseudo-random number interface
In monadic code, use \'System.Random.Stateful.uniformM\' and
\'System.Random.Stateful.uniformRM\' from \"System.Random.Stateful\" to generate
pseudo-random numbers with a monadic pseudo-random number generator, or using a
monadic adapter.
As an example, here is how you can simulate rolls of a six-sided die using
\'System.Random.Stateful.uniformRM\':
>>> let rollM = uniformRM (1, 6) :: StatefulGen g m => g -> m Word >>> let
pureGen = mkStdGen 42 >>> runStateGen_ pureGen (replicateM 10 . rollM) ::
[Word] [1,1,3,2,4,5,3,4,6,2]
The monadic adapter \'System.Random.Stateful.runStateGen_\' is used here to lift
the pure pseudo-random number generator \'pureGen\' into the
\'System.Random.Stateful.StatefulGen\' context.
The monadic interface can also be used with existing monadic pseudo-random
number generators. In this example, we use the one provided in the
< https://hackage.haskell.org/package/mwc-random mwc-random> package:
>>> import System.Random.MWC as MWC >>> let rollM = uniformRM (1, 6) ::
StatefulGen g m => g -> m Word >>> monadicGen < - MWC.create >>> replicateM 10
(rollM monadicGen) :: IO [Word] [2,3,6,6,4,4,3,1,5,4]
See \"System.Random.Stateful\" for more details.
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RPM found in directory: /packages/linux-pbone/ftp5.gwdg.de/pub/opensuse/repositories/devel:/languages:/haskell:/ghc-9.8.x/Tumbleweed/x86_64 |
