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 full_int : int -> int

       Random.full_int  bound  returns  a  random  integer  between  0  (inclusive)   and   bound
       (exclusive).  bound may be any positive integer.

       If  bound is less than 2^30, Random.full_int bound is equal to Random.int bound . If bound
       is greater than 2^30 (on 64-bit systems or non-standard environments, such as JavaScript),
       Random.full_int returns a value, where Random.int raises Invalid_argument .

       Since 4.13.0

       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.

       val bits32 : unit -> Int32.t

       Random.bits32  ()  returns  32  random  bits  as  an  integer  between  Int32.min_int  and
       Int32.max_int .

       Since 4.14.0

       val bits64 : unit -> Int64.t

       Random.bits64  ()  returns  64  random  bits  as  an  integer  between  Int64.min_int  and
       Int64.max_int .

       Since 4.14.0

       val nativebits : unit -> Nativeint.t

       Random.nativebits  ()  returns  32  or  64  random bits (depending on the bit width of the
       platform) as an integer between Nativeint.min_int and Nativeint.max_int .

       Since 4.14.0

   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.