test_interp_2d, a C code which defines test problems for interpolation of data z(x,y)), depending on a 2D argument.
The code requires access to the R8LIB library.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
test_interp_2d is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
LAGRANGE_INTERP_2D, a C code which defines and evaluates the Lagrange polynomial p(x,y) which interpolates a set of data depending on a 2D argument that was evaluated on a product grid, so that p(x(i),y(j)) = z(i,j).
PADUA, a C code which returns the points and weights for Padu sets, useful for interpolation in 2D. GNUPLOT is used to plot the points.
PWL_INTERP_2D, a C code which evaluates a piecewise linear interpolant to data defined on a regular 2D grid.
R8LIB, a C code which contains many utility routines, using double precision real (R8) arithmetic.
RBF_INTERP_2D, a C code which defines and evaluates radial basis function (RBF) interpolants to data in two dimensions.
TEST_INTERP_1D, a C code which defines test problems for interpolation of data y(x), depending on a 1D argument.
TEST_INTERP_ND, a C code which defines test problems for interpolation of data z(x), depending on an M-dimensional argument.
TOMS886, a C code which defines the Padua points for interpolation in a 2D region, including the rectangle, triangle, and ellipse, by Marco Caliari, Stefano de Marchi, Marco Vianello. This is a C version of ACM TOMS algorithm 886.