Quadratic splines have user applications.
This Smath document is for your spline tool box.
Part 1 is Edu, Part 2 the user tool.

Part 2 USER: is ready to use as independent document.

Jean

Spline Lagrange [Quadratic knots].sm (70.75 KiB) downloaded 692 time(s).

Spline Lagrange [Quadratic knots USER].sm (44.96 KiB) downloaded 713 time(s).