# Cubic spline interpolation

This tools performs and visualizes a cubic spline interpolation for a given set of points.

Syntax for entering a set of points: Spaces separate x- and y-values of a point and a Newline distinguishes the next point. Hit the button Show example to see a demo.

### Equation

The algorithm calculates a "natural" spline: The boundary splines turn into a straight line (the second derivative is equal to zero in the end points).

x-value

### Graph

math interpolation cubic spline function points x y