nearest_interp_1d, an Octave code which interpolates a set of data using a piecewise constant interpolant defined by the nearest neighbor criterion.
The code needs the r8lib() library. The test also needs the TEST_INTERP library.
The information on this web page is 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, an Octave code which finds a polynomial interpolant to data using Newton divided differences.
pwl_interp_1d, an Octave code which interpolates a set of data using a piecewise linear interpolant.
r8lib, an Octave code which contains many utility routines using double precision real (R8) arithmetic.
test_interp, an Octave code which defines a number of test problems for interpolation, provided as a set of (x,y) data.