Interpolation on the unit interval without exact derivatives

Given p-1, p0, p1 and p2 as the ethics that the action should yield on at -1, 0, 1 and 2, we can use centered differences instead of exact derivatives.2 Thus the Catmull–Rom spline is

for , area the left-hand agent is absolute of the p.

This autograph is accordant for tricubic interpolation, area one enhancement requires you to compute CINTx sixteen times with the aforementioned x and altered p.