Provided by: ocaml-man_4.14.1-1ubuntu1_all 
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.