Use cubic splines for approximation of a function with given pairs (x,y)
See
- https://brodowsky.it-sky.net/2021/01/29/splines-approximation-introduction/
- https://brodowsky.it-sky.net/2021/02/12/spline-approximation-mathematics/
- https://brodowsky.it-sky.net/2021/05/28/spline-approximation-mathematics-ii/
for more details and the theory behind this project.