Hello, it would be great if you can help me to solve this problem I am facing. Let us suppose to have three different list: x={0.0,0.1,0.2,0.2,0.3,0.3,.....} y={0.1,0.2,0.3,0.4,1.0,1.5,2.0,3.0,4.0,5.0,....} z={0.01,0.02,0.022,0.023,0.02344,.....} All three arrays have the same length. Then, I have this function to apply over the list above: f where P is an interpolation function which depends on f[], namely it is created using the past data computed with the function f[] and assuming that P[0]=1. Is there any elegant way to implement this loop ?

Thank you Paolo