NAME

       Random - Pseudo-random number generators (PRNG).

Module

       Module   Random

Documentation

       Module Random
        : sig end

       Pseudo-random number generators (PRNG).

       === Basic functions ===

       val init : int -> unit

       Initialize  the  generator, using the argument as a seed.  The same seed will always yield
       the same sequence of numbers.

       val full_init : int array -> unit

       Same as Random.init but takes more data as seed.

       val self_init : unit -> unit

       Initialize the generator with  a  random  seed  chosen  in  a  system-dependent  way.   If
       /dev/urandom  is  available  on  the  host  machine, it is used to provide a highly random
       initial seed.  Otherwise, a less random seed is computed from system  parameters  (current
       time, process IDs).

       val bits : unit -> int

       Return 30 random bits in a nonnegative integer.

       Before3.12.0 used a different algorithm (affects all the following functions)

       val int : int -> int

       Random.int  bound  returns  a  random integer between 0 (inclusive) and bound (exclusive).
       bound must be greater than 0 and less than 2^{30.

       val int32 : Int32.t -> Int32.t

       Random.int32 bound returns a random integer between 0 (inclusive) and  bound  (exclusive).
       bound must be greater than 0.

       val nativeint : Nativeint.t -> Nativeint.t

       Random.nativeint   bound  returns  a  random  integer  between  0  (inclusive)  and  bound
       (exclusive).  bound must be greater than 0.

       val int64 : Int64.t -> Int64.t

       Random.int64 bound returns a random integer between 0 (inclusive) and  bound  (exclusive).
       bound must be greater than 0.

       val float : float -> float

       Random.float bound returns a random floating-point number between 0 and bound (inclusive).
       If bound is negative, the result is negative or zero.  If bound is 0, the result is 0.

       val bool : unit -> bool

       Random.bool () returns true or false with probability 0.5 each.

       === Advanced functions ===

       === The functions from module Random.State manipulate the  current  state  of  the  random
       generator  explicitly.   This  allows  using one or several deterministic PRNGs, even in a
       multi-threaded program, without interference from other parts of the program. ===

       module State : sig end

       val get_state : unit -> State.t

       Return the current state of the generator used by the basic functions.

       val set_state : State.t -> unit

       Set the state of the generator used by the basic functions.