This module contains convenience functions for generating pseudo-random numbers using the default pseudo-random number generator (currently a 64-bit Mersenne Twister, initialized with a random seed).

To generate a repeatable sequence of pseudo-random numbers, use a generator from the std::mt64 module.

Functions

rand_float() -> f64

Returns a uniformly-distributed random float from the half-open interval [0, 1), i.e. the interval from zero up to but not including 1. The generator produces floats with 53 bits of precision.

rand_int(n: i64) -> i64

Returns a uniformly-distributed random integer from the half-open interval [0, n), i.e. the interval from zero up to but not including n, where n is a positive integer.

rand_int_in_range(lower: i64, upper: i64) -> i64

Returns a uniformly-distributed random integer from the half-open interval [lower, upper), i.e. the interval from lower up to but not including upper.

The arguments can be positive or negative or mixed as long as lower is less than or equal to upper.