Approximation

This section presents packages for working with polynomials, interpolation and data fitting functions. Modules for creating and processing various types of polynomials are included, including Chebyshev polynomials and their extensions, allowing accurate approximation and function modelling. Also included are interpolation methods that support flexible control of interpolation algorithms, extrapolation, and integration with ChainRulesCore for advanced derivative calculations.

The section also covers generalised linear models (GLM) approximation and non-linear least square methods, providing users with functions to select parameters and perform regression.