Module: numerics/spline

1-parameter cubic spline (Spline) on a uniform grid, plus auxiliary polynomial fitters. Used throughout the property databases (gas tables, materials) for smooth 1-D property curves.

Documents

Document	Contents
spline_usage_guide.md	How to build/evaluate a Spline, boundary conditions, extrapolation, thermo extra modes, pitfalls; and orientation on the related 2-/3-parameter B-spline lookup tables (physics/database)

Quick reference

Class / function	Purpose	Source
Spline	Cubic spline, uniform grid, C² (natural/parabolic/clamped BCs)	cl_Spline.hpp/.cpp
spline::create_helpmatrix	Build the shared help matrix for a grid	cl_Spline.hpp:27-33
create_truss_poly	Cubic through 2 values + 2 slopes	fn_Create_Truss_Poly.hpp
create_glue_poly	Quartic through 5 conditions	fn_Create_Glue_Poly.hpp

Related modules

physics/database — 2-/3-parameter B-spline lookup tables (Database).
tests/math/test_Spline.cpp — unit tests.