| impute_gradients | impute gradients from two vectors with x and y coordinates. |
| make_approx_functions_from_dataframe | make_approx_functions_from_dataframe |
| ppmak | ppmak |
| ppmak2Deriv | ppmak2Deriv |
| ppmakDeriv | ppmakDeriv |
| Schumaker | Create a Schumaker spline |
| SchumakerIndInterval | SchumakerIndInterval |