pyratapprox: Approximation by rational functions

pyratapprox provides a Python interface to Julia's RationalFunctionApproximation library, enabling efficient computation of rational function approximations and interpolations.

Installation

pip install pyratapprox

Note: Requires Julia to be installed. The required Julia packages will be installed automatically on first use.

Quick Start

import numpy as np
from pyratapprox import approximate, unitinterval, AAA

# Approximate a function on the unit interval [-1, 1]
f = approximate(np.sin, unitinterval, method=AAA)

# Evaluate the approximation
y = f(0.5)

# Get poles and residues
poles = f.poles()
poles, residues = f.residues()

Documentation

Full documentation is available at: https://complexvariables.github.io/pyratapprox

License

MIT License

Author

Toby Driscoll (driscoll@udel.edu)