nearest_interp_1d, an Octave code which interpolates a set of data using a piecewise constant interpolant defined by the nearest neighbor criterion.
NEAREST_INTERP_1D needs the R8LIB library. The test also 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
nearest_interp_1d is available in a C version and a C++ version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.
newton_interp_1d, a MATLAB code which finds a polynomial interpolant to data using Newton divided differences.
pwl_interp_1d, a MATLAB code which interpolates a set of data using a piecewise linear interpolant.
r8lib, a MATLAB code which contains many utility routines using double precision real (R8) arithmetic.
test_interp, a MATLAB code which defines a number of test problems for interpolation, provided as a set of (x,y) data.