Struct LogNormal 

pub struct LogNormal;

Log-normal chain length distribution.

Flexible distribution parameterized by Mn and PDI: σ² = ln(PDI), μ = ln(Xn) − σ²/2

Note: the relation PDI = exp(σ²) is exact for a continuous mass distribution. When end-group mass (m_end) is non-negligible compared to Mn, the actual PDI of the generated ensemble will deviate slightly because MW(n) = n·m0 + m_end introduces a constant offset. The approximation is excellent when m_end << Mn (typical for high-MW polymers).

Suitable for most synthetic polymers (radical, anionic, etc.).

Trait Implementations

impl ChainLengthDistribution for LogNormal

fn sample( &self, mn: f64, pdi: f64, m0: f64, num_chains: usize, rng: &mut dyn RngCore, ) -> Vec<usize>

Sample num_chains chain lengths (each ≥ 1).

fn name(&self) -> &'static str

Human-readable name for display purposes.