NEWS

Dcurvature 0.0.4 (2026-07-20)

select_components(): exposes the discrete-curvature elbow criterion (adaptive m* from first/second-order operators, plus the extended m** with a minimum cumulative-variance threshold tau) as a single reproducible call. The same logic was previously only reachable inside the Shiny app, so results reported in the accompanying article can now be reproduced programmatically.

Corrected the adaptive selection rule (mstar_fn) to follow the manuscript (Section 4) faithfully. It now operates directly on the boundary-extended curvature (with the endpoint zeros kept) and drops the +1 / +2+1 index offsets that made the package return one component too many. Keeping the boundary zeros lets the first-order operator detect a dominant first component at m = 1. The selected m* now matches the curvature / second-difference peak shown in the results table (and the value reported in the article). The rule is identical across select_components() and both bundled Shiny apps.