module Random: Randomval init : int -> unitInitialize the domain-local generator, using the argument as a seed. The same seed will always yield the same sequence of numbers.
val full_init : int array -> unitSame as Random.init but takes more data as seed.
val self_init : unit -> unitInitialize the domain-local 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, domain-local state).
val bits : unit -> intReturn 30 random bits in a nonnegative integer.
val int : int -> intRandom.int bound returns a random integer between 0 (inclusive)
and bound (exclusive). bound must be greater than 0 and less
than 230.
val full_int : int -> intRandom.full_int bound returns a random integer between 0 (inclusive)
and bound (exclusive). bound may be any positive integer.
If bound is less than 230, Random.full_int bound is equal to
Random.int bound. If bound is greater than 230 (on 64-bit systems
or non-standard environments, such as JavaScript), Random.full_int
returns a value, where Random.int raises Invalid_argument.
val int32 : Int32.t -> Int32.tRandom.int32 bound returns a random integer between 0 (inclusive)
and bound (exclusive). bound must be greater than 0.
val nativeint : Nativeint.t -> Nativeint.tRandom.nativeint bound returns a random integer between 0 (inclusive)
and bound (exclusive). bound must be greater than 0.
val int64 : Int64.t -> Int64.tRandom.int64 bound returns a random integer between 0 (inclusive)
and bound (exclusive). bound must be greater than 0.
val float : float -> floatRandom.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 -> boolRandom.bool () returns true or false with probability 0.5 each.
val bits32 : unit -> Int32.tRandom.bits32 () returns 32 random bits as an integer between
Int32.min_int and Int32.max_int.
val bits64 : unit -> Int64.tRandom.bits64 () returns 64 random bits as an integer between
Int64.min_int and Int64.max_int.
val nativebits : unit -> Nativeint.tRandom.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.
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.tget_state() returns a fresh copy of the current state of the
domain-local generator (which is used by the basic functions).
val set_state : State.t -> unitset_state s updates the current state of the domain-local
generator (which is used by the basic functions) by copying
the state s into it.
val split : unit -> State.tDraw a fresh PRNG state from the current state of the domain-local
generator used by the default functions.
(The state of the domain-local generator is modified.)
See Random.State.split.