PWL_INTERP_2D
Piecewise Linear Interpolation in 2D for Gridded Data

PWL_INTERP_2D is a Python library which evaluates a piecewise linear interpolant of data depending on a 2D argument, defined on on a product grid, so that p(x(i),y(j)) = z(i,j).

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

PWL_INTERP_2D is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.

Related Data and Programs:

PADUA, a Python library which returns the points and weights for Padu sets, useful for interpolation in 2D. MATLAB graphics are used to plot the points.

PWL_INTERP_1D, a Python library which interpolates a set of data using a piecewise linear function.

R8LIB, a Python library which contains many utility routines using double precision real (R8) arithmetic.

RBF_INTERP_2D, a Python library which defines and evaluates radial basis function (RBF) interpolants to 2D data.

TEST_INTERP_2D, a Python library which defines test problems for interpolation of data z(x,y), depending on a 2D argument.

Reference:

1. Kendall Atkinson,
   An Introduction to Numerical Analysis,
   Prentice Hall, 1989,
   ISBN: 0471624896,
   LC: QA297.A94.1989.
2. Philip Davis,
   Interpolation and Approximation,
   Dover, 1975,
   ISBN: 0-486-62495-1,
   LC: QA221.D33
3. David Kahaner, Cleve Moler, Steven Nash,
   Numerical Methods and Software,
   Prentice Hall, 1989,
   ISBN: 0-13-627258-4,
   LC: TA345.K34.

Source Code:

• pwl_interp_2d.py, evaluates a piecewise linear interpolant to data defined on a 2D grid.
• pwl_interp_2d.sh, runs the tests.
• pwl_interp_2d.txt, the output file.

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