Struct PolyaGamma 

pub struct PolyaGamma { /* private fields */ }

Sampler for the Pólya–Gamma PG(1, c) distribution.

This type intentionally exposes only the shape-one surface used by GAM’s Gibbs and validation paths. Shape selection and all sampling mathematics stay inside the upstream crate.

Implementations

impl PolyaGamma

pub fn new() -> Self

Construct an upstream sampler fixed at shape b = 1.

pub fn draw<R: Rng + ?Sized>(&self, rng: &mut R, tilt: f64) -> f64

Draw a single PG(1, c) variate from the caller’s rand 0.10 stream.

A Pólya–Gamma variate is strictly positive with a continuous density, so an exact 0.0, a negative value, or a non-finite value can only be a numerical artifact of the upstream sampler. Rejecting those measure-zero artifacts preserves the target distribution without a finite retry budget. Non-finite tilts are rejected before entering the upstream rejection sampler, where they would make its loop undefined.

Trait Implementations

impl Clone for PolyaGamma

fn clone(&self) -> PolyaGamma

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PolyaGamma

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.