Function elastic_align_pair 

pub fn elastic_align_pair(
    f1: &[f64],
    f2: &[f64],
    argvals: &[f64],
    lambda: f64,
) -> AlignmentResult

Align curve f2 to curve f1 using the elastic framework.

Computes the optimal warping γ such that f2∘γ is as close as possible to f1 in the elastic (Fisher-Rao) metric.

Arguments

• f1 — Target curve (length m)
• f2 — Curve to align (length m)
• argvals — Evaluation points (length m)
• lambda — Penalty weight on warp deviation from identity (0.0 = no penalty)

Returns

AlignmentResult with warping function, aligned curve, and elastic distance.