least_squares_approximant, an Octave code which finds a polynomial approximant to data using linear least squares (LLS).
The computer code and data files described and made available on this web page are distributed under the MIT license
least_squares_approximant is available in a MATLAB version and an Octave version.
least_squares_approximant_test
chebyshev, an Octave code which computes the Chebyshev interpolant/approximant to a given function over an interval.
divdif, an Octave code which uses divided differences to compute the polynomial interpolant to a given set of data.
hermite_interpolant, an Octave code which computes the Hermite interpolant, a polynomial that matches function values and derivatives.
rbf_interp_1d, an Octave code which defines and evaluates radial basis function (RBF) interpolants to 1D data.
spline, an Octave code which constructs and evaluates spline interpolants and approximants.
test_interp, an Octave code which defines a number of test problems for interpolation, provided as a set of (x,y) data.
test_interp_fun, an Octave code which defines a number of test problems for interpolation, provided as functions (x,f(x)).
vandermonde_interp_1d, an Octave code which finds a polynomial interpolant to data by setting up and solving a linear system involving the Vandermonde matrix.