INTERP is a MATLAB library which takes a set of data associated with successive values of a parameter, and produces an interpolating function which can be evaluated over a continuous range of the parameter.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
INTERP is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version.
DIVDIF, a MATLAB library which uses divided differences to interpolate data.
HERMITE, a MATLAB library which computes the Hermite interpolant, a polynomial that matches function values and derivatives.
LAGRANGE_INTERP_1D, a MATLAB library which defines and evaluates the Lagrange polynomial p(x) which interpolates a set of data, so that p(x(i)) = y(i).
RBF_INTERP_1D, a MATLAB library which defines and evaluates radial basis function (RBF) interpolants to 1D data.
SHEPARD_INTERP_1D, a MATLAB library which defines and evaluates Shepard interpolants to 1D data, which are based on inverse distance weighting.
SPARSE_INTERPOLANT a MATLAB library which can be used to define a sparse interpolant to a function f(x) of a multidimensional argument.
SPLINE, a MATLAB library which computes functions that approximate or interpolate data.
TEST_APPROX, a MATLAB library which defines a number of test problems for approximation and interpolation.
TEST_INTERP, a MATLAB library which defines a number of test problems for interpolation, provided as a set of (x,y) data.
TEST_INTERP_1D, a MATLAB library which defines test problems for interpolation of data y(x), depending on a 1D argument.
VANDERMONDE_INTERP_1D, a MATLAB library which finds a polynomial interpolant to data by setting up and solving a linear system involving the Vandermonde matrix.
You can go up one level to the MATLAB source codes.