Module Random

module Random: sig  end

Pseudo-random number generator (PRNG).

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 more-or-less random seed chosen in a system-dependent way.

val bits : unit -> int

Return 30 random bits in a nonnegative integer.

val int : int -> int

Random.int bound returns a random integer between 0 (inclusive) and bound (exclusive). bound must be more than 0 and less than 2³⁰.

val float : float -> float

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

val bool : unit -> bool

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

type state

Values of this type are used to store the current state of the generator.

val get_state : unit -> state

Returns the current state of the generator. This is useful for checkpointing computations that use the PRNG.

val set_state : state -> unit

Resets the state of the generator to some previous state returned by Random.get_state.