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<html>
<head>
<title>
SHEPARD_INTERP_2D - Shepard Interpolation of 2D Data
</title>
</head>
<body bgcolor="#eeeeee" link="#cc0000" alink="#ff3300" vlink="#000055">
<h1 align = "center">
SHEPARD_INTERP_2D <br> Shepard Interpolation of 2D Data
</h1>
<hr>
<p>
<b>SHEPARD_INTERP_2D</b>
is a C++ library which
defines and evaluates Shepard interpolants to 2D data,
based on inverse distance weighting.
</p>
<p>
<b>SHEPARD_INTERP_2D</b> needs the R8LIB library. The test also needs the
TEST_INTERP_2D library.
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and made available on this web page
are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>SHEPARD_INTERP_2D</b> is available in
<a href = "../../c_src/shepard_interp_2d/shepard_interp_2d.html">a C version</a> and
<a href = "../../cpp_src/shepard_interp_2d/shepard_interp_2d.html">a C++ version</a> and
<a href = "../../f77_src/shepard_interp_2d/shepard_interp_2d.html">a FORTRAN77 version</a> and
<a href = "../../f_src/shepard_interp_2d/shepard_interp_2d.html">a FORTRAN90 version</a> and
<a href = "../../m_src/shepard_interp_2d/shepard_interp_2d.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../cpp_src/lagrange_interp_2d/lagrange_interp_2d.html">
LAGRANGE_INTERP_2D</a>,
a C++ library 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).
</p>
<p>
<a href = "../../cpp_src/padua/padua.html">
PADUA</a>,
a C++ library which
returns the points and weights for Padu sets, useful for interpolation
in 2D. GNUPLOT is used to plot the points.
</p>
<p>
<a href = "../../cpp_src/pwl_interp_2d/pwl_interp_2d.html">
PWL_INTERP_2D</a>,
a C++ library which
evaluates a piecewise linear interpolant to data defined on
a regular 2D grid.
</p>
<p>
<a href = "../../cpp_src/r8lib/r8lib.html">
R8LIB</a>,
a C++ library which
contains many utility routines using double precision real (R8) arithmetic.
</p>
<p>
<a href = "../../cpp_src/rbf_interp_2d/rbf_interp_2d.html">
RBF_INTERP_2D</a>,
a C++ library which
defines and evaluates radial basis function (RBF) interpolants to 2D data.
</p>
<p>
<a href = "../../cpp_src/shepard_interp_1d/shepard_interp_1d.html">
SHEPARD_INTERP_1D</a>,
a C++ library which
defines and evaluates Shepard interpolants to 1D data,
based on inverse distance weighting.
</p>
<p>
<a href = "../../cpp_src/shepard_interp_nd/shepard_interp_nd.html">
SHEPARD_INTERP_ND</a>,
a C++ library which
defines and evaluates Shepard interpolants to multidimensional data,
based on inverse distance weighting.
</p>
<p>
<a href = "../../cpp_src/test_interp_2d/test_interp_2d.html">
TEST_INTERP_2D</a>,
a C++ library which
defines test problems for interpolation of data z(x,y)),
depending on a 2D argument.
</p>
<p>
<a href = "../../cpp_src/toms886/toms886.html">
TOMS886</a>,
a C++ library 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.
</p>
<p>
<a href = "../../cpp_src/vandermonde_interp_2d/vandermonde_interp_2d.html">
VANDERMONDE_INTERP_2D</a>,
a C++ library which
finds a polynomial interpolant to data z(x,y) of a 2D argument
by setting up and solving a linear system for the polynomial coefficients,
involving the Vandermonde matrix.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Richard Franke,<br>
Scattered Data Interpolation: Tests of Some Methods,<br>
Mathematics of Computation,<br>
Volume 38, Number 157, January 1982, pages 181-200.
</li>
<li>
Donald Shepard,<br>
A two-dimensional interpolation function for irregularly spaced data,<br>
ACM '68: Proceedings of the 1968 23rd ACM National Conference,<br>
ACM, pages 517-524, 1969.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "shepard_interp_2d.cpp">shepard_interp_2d.cpp</a>, the source code.
</li>
<li>
<a href = "shepard_interp_2d.hpp">shepard_interp_2d.hpp</a>, the include file.
</li>
<li>
<a href = "shepard_interp_2d.sh">shepard_interp_2d.sh</a>,
BASH commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "shepard_interp_2d_prb.cpp">shepard_interp_2d_prb.cpp</a>,
a sample calling program.
</li>
<li>
<a href = "shepard_interp_2d_prb.sh">shepard_interp_2d_prb.sh</a>,
BASH commands to compile and run the sample program.
</li>
<li>
<a href = "shepard_interp_2d_prb_output.txt">shepard_interp_2d_prb_output.txt</a>,
the output file.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>SHEPARD_INTERP_2D</b> evaluates a 2D Shepard interpolant.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../cpp_src.html">
the C++ source codes</a>.
</p>
<hr>
<i>
Last revised on 02 October 2012.
</i>
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