Function elastic_depth 

pub fn elastic_depth(
    data: &FdMatrix,
    argvals: &[f64],
    lambda: f64,
) -> Result<ElasticDepthResult, FdarError>

Compute amplitude + phase decomposed elastic depth.

For each curve, the depth is defined as an inverse-average-distance formulation (lens depth): depth_i = 1 / (1 + mean_dist_to_others). The combined depth is the geometric mean of amplitude and phase depths.

Arguments

• data — Functional data matrix (n x m)
• argvals — Evaluation points (length m)
• lambda — Roughness penalty for elastic alignment (0.0 = no penalty)

Errors

Returns FdarError::InvalidDimension if argvals length does not match m or n < 2.