pwl_interp_2d_scattered_test, a Fortran90 code which calls pwl_interp_2d_scattered(), which produces a piecewise linear interpolant to 2D scattered data, that is, data that is not guaranteed to lie on a regular grid.
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pwl_interp_2d_scattered, a Fortran90 code which evaluates a piecewise linear interpolant to data which is available at an irregularly arranged set of points.