vandermonde_approx_2d_test, a Fortran90 code which calls vandermonde_approx_2d(), which finds P(X,Y), a polynomial approximant to Z which depends on two independent variables X and Y, by setting up and solving an overdetermined linear system involving the Vandermonde matrix.
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vandermonde_approx_2d, a Fortran90 code which finds a polynomial approximant p(x,y) to data z(x,y) of a 2D argument by setting up and solving an overdetermined linear system for the polynomial coefficients involving the vandermonde matrix.