Pileas, There are some older threads in this group about interpolations, just use the search function to find them. In one of those discussions I also posted this piece of code <https://github.com/nilshg/LearningModels/blob/master/Test_Interpolations.jl>, which compares the interpolations in Grid with Dierckx and NumericalMath. I have since figured out how to use ApproxD, so I guess I should update the code...
Best, Nils
