Function elastic_align_pair_constrained 

pub fn elastic_align_pair_constrained(
    f1: &[f64],
    f2: &[f64],
    argvals: &[f64],
    landmark_pairs: &[(f64, f64)],
    lambda: f64,
) -> ConstrainedAlignmentResult

Align f2 to f1 with landmark constraints.

Landmark pairs define waypoints on the DP grid. Between consecutive waypoints, an independent smaller DP is run. The resulting warp passes through all landmarks.

Arguments

• f1 — Target curve (length m)
• f2 — Curve to align (length m)
• argvals — Evaluation points (length m)
• landmark_pairs — (target_t, source_t) pairs in increasing order
• lambda — Penalty weight

Returns

ConstrainedAlignmentResult with warp, aligned curve, and enforced landmarks.