pwl_interp_1d, a C code which interpolates a set of data with a piecewise linear function, creating graphics files for processing by gnuplot().
The test code needs the test_interp() library.
The computer code and data files described and made available on this web page are distributed under the MIT license
pwl_interp_1d is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
barycentric_interp_1d, a C code which defines and evaluates the barycentric Lagrange polynomial p(x) which interpolates a set of data, so that p(x(i)) = y(i). The barycentric approach means that very high degree polynomials can safely be used.
chebyshev_interp_1d, a C code which determines the combination of Chebyshev polynomials which interpolates a set of data, so that p(x(i)) = y(i).
gnuplot_test, C codes which illustrate how a program can write data and command files so that gnuplot() can create plots of the program results.
lagrange_interp_1d, a C code which defines and evaluates the Lagrange polynomial p(x) which interpolates a set of data, so that p(x(i)) = y(i).
nearest_interp_1d, a C code which interpolates a set of data using a piecewise constant interpolant defined by the nearest neighbor criterion.
newton_interp_1d, a C code which finds a polynomial interpolant to data using Newton divided differences.
pwl_approx_1d, a C code which approximates a set of data using a piecewise linear function.
pwl_interp_2d, a C code which evaluates a piecewise linear interpolant to data defined on a regular 2D grid.
rbf_interp_1d, a C code which defines and evaluates radial basis function (RBF) interpolants to 1D data.
shepard_interp_1d, a C code which defines and evaluates Shepard interpolants to 1D data, based on inverse distance weighting.
shepard_interp_1d, a C code which defines and evaluates Shepard interpolants to 1D data, which are based on inverse distance weighting.
test_interp, a C code which defines a number of test problems for interpolation, provided as a set of (x,y) data.
test_interp_1d, a C code which defines test problems for interpolation of data y(x), depending on a 1D argument.
vandermonde_interp_1d, a C code which finds a polynomial interpolant to data y(x) of a 1D argument, by setting up and solving a linear system for the polynomial coefficients, involving the Vandermonde matrix.