Function norm_lp 

pub fn norm_lp(data: &FdMatrix, argvals: &[f64], p: f64, dim: Dim) -> Vec<f64>

Compute Lp norm for each sample via a unified Dim dispatch.

The 2D path never diverged from the 1D one, so both Dim arms forward to [norm_lp_1d]. The dim argument makes caller intent explicit and provides a single future seam should a real 2D specialization ever be needed.

Arguments

• data - Functional data matrix (n x m)
• argvals - Evaluation points for integration
• p - Order of the norm (e.g., 2.0 for L2)
• dim - Dimensionality selector (Dim::One or Dim::Two)