Fast Relaxed Vector Fitting implementation for Python. vectfit3.py module for python projects

Object-oriented continued fractions with Python.

Vector Fitting is an algorithm used to approximate frequency-domain responses with rational functions. It is based on pole relocation through a least-squares fitting process, ensuring stable and accurate approximations. This repo contains an implementation of the VF algorithm, inspired by the original vectfit3.m MATLAB script by Bjørn Gustavsen.

Nep2rat is a tool to rationally approximate nonlinear matrix-valued functions, mainly aimed to solve nonlinear eigenvalue problems

Rational kernel-based interpolation for complex-valued frequency response functions [arXiv:2307.13484]

A collection of algorithms to approximate the unitary exponential function with a focus on unitary best approximations.

Approximate a decimal or rational number with bounded nominator and denominator.

Contains routines for rational interpolation of functions

The Caratheodory-Fejer method for designing recursive digital filters

A Fortran library for performing rational approximation of functions.