Function elastic_align_pair_closed 

pub fn elastic_align_pair_closed(
    f1: &[f64],
    f2: &[f64],
    argvals: &[f64],
    lambda: f64,
) -> Result<ClosedAlignmentResult, FdarError>

Align closed curve f2 to closed curve f1 with rotation search.

For closed (periodic) curves, the starting point is arbitrary. This function searches over circular shifts of f2 to find the rotation that minimizes the elastic distance, then performs full elastic alignment at that rotation.

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)

Errors

Returns FdarError::InvalidDimension if lengths do not match or m < 2.