Function functional_pdp 

pub fn functional_pdp(
    fit: &FregreLmResult,
    data: &FdMatrix,
    _scalar_covariates: Option<&FdMatrix>,
    component: usize,
    n_grid: usize,
) -> Option<FunctionalPdpResult>

Functional PDP/ICE for a linear functional regression model.

Varies the FPC score for component across a grid while keeping other scores fixed, producing ICE curves and their average (PDP).

For a linear model, ICE curves are parallel lines (same slope, different intercepts).

Arguments

• fit — A fitted FregreLmResult
• data — Original functional predictor matrix (n × m)
• scalar_covariates — Optional scalar covariates (n × p)
• component — Which FPC component to vary (0-indexed, must be < fit.ncomp)
• n_grid — Number of grid points (must be ≥ 2)