Stdlib.Random(3o) OCaml library Stdlib.Random(3o)
NAME
Stdlib.Random - no description
Module
Module Stdlib.Random
Documentation
Module Random
: (module Stdlib__Random)
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-depen-
dent 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 Ran-
dom.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.
Advanced functions
The functions from module Random.State manipulate the current state of
the random generator explicitly. This allows using one or several de-
terministic PRNGs, even in a multi-threaded program, without interfer-
ence 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.
OCamldoc 2023-02-12 Stdlib.Random(3o)
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