Struct Rng 

pub struct Rng { /* private fields */ }

Minimal seeded pseudo-random number generator.

Uses xorshift64: no heap allocations, no platform-specific dependencies, and produces identical output on wasm32-wasip2 and x86_64.

NOT cryptographically secure — only for reproducible synthetic data.

Implementations

impl Rng

pub fn new(seed: u64) -> Self

Create a new RNG seeded with seed.

The seed is mixed with a constant to avoid degenerate all-zero state. Eight warm-up steps eliminate any bias from the initial seed mix.

pub fn next_u64(&mut self) -> u64

Advance state and return the next u64.

pub fn uniform(&mut self, min: f64, max: f64) -> f64

Uniform sample in [min, max).

pub fn normal(&mut self) -> f64

Standard normal sample via Box-Muller transform.

Avoids ln(0) by clamping the uniform draw from below.