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fem_to_triangle.html
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<html>
<head>
<title>
FEM_TO_TRIANGLE - Convert a Mesh from FEM to Triangle Format
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
FEM_TO_TRIANGLE <br> Convert a Mesh from FEM to Triangle Format
</h1>
<hr>
<p>
<b>FEM_TO_TRIANGLE</b>
is a C program which
reads FEM files of node coordinates and element connectivity,
which define a mesh of a 2D region, divided into triangular elements,
and creates a corresponding pair of Triangle files.
</p>
<p>
These files can be used as input to Triangle for viewing, or mesh refinement.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<blockquote>
<b>fem_to_triangle</b> <i>prefix</i>
</blockquote>
where <i>prefix</i> is the common filename prefix:
<ul>
<li>
<i>'prefix'</i>_nodes.txt contains the node coordinates,
</li>
<li>
<i>'prefix'</i>_elements.txt contains the element definitions.
</li>
<li>
<i>'prefix'</i>.node will be the Triangle node file.
</li>
<li>
<i>'prefix'</i>.ele will be the Triangle element file.
</li>
</ul>
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files 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>FEM_TO_TRIANGLE</b> is available in
<a href = "../../c_src/fem_to_triangle/fem_to_triangle.html">a C version</a> and
<a href = "../../cpp_src/fem_to_triangle/fem_to_triangle.html">a C++ version</a> and
<a href = "../../f77_src/fem_to_triangle/fem_to_triangle.html">a FORTRAN77 version</a> and
<a href = "../../f_src/fem_to_triangle/fem_to_triangle.html">a FORTRAN90 version</a> and
<a href = "../../m_src/fem_to_triangle/fem_to_triangle.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../c_src/fem_io/fem_io.html">
FEM_IO</a>,
a C library which
reads or writes node, element and data files defining a model
associated with the finite element method (FEM).
</p>
<p>
<a href = "../../c_src/fem_to_gmsh/fem_to_gmsh.html">
FEM_TO_GMSH</a>,
a C program which
reads FEM files definining a 1D, 2D or 3D mesh, namely
a file of node coordinates and a file of elements defined by
node indices, and creates a Gmsh mesh file.
</p>
<p>
<a href = "../../c_src/fem_to_medit/fem_to_medit.html">
FEM_TO_MEDIT</a>,
a C program which
reads a pair of FEM files defining node coordinates and elements,
and creates a corresponding MEDIT mesh file.
</p>
<p>
<a href = "../../c_src/fem_to_xml/fem_to_xml.html">
FEM_TO_XML</a>,
a C program which
reads FEM files defining a 1D, 2D or 3D mesh, namely
a file of node coordinates and a file of elements defined by
node indices, and creates a corresponding XML file for input
to DOLFIN or FENICS.
</p>
<p>
<a href = "../../data/fem2d/fem2d.html">
FEM2D</a>,
a data directory which
contains examples of 2D FEM files, text files that describe a
2D geometry and node values
associated with the finite element method (FEM);
</p>
<p>
<a href = "../../data/triangle_files/triangle_files.html">
TRIANGLE_FILES</a>,
a data directory which
contains examples of files used by the triangle() and showme() programs.
</p>
<p>
<a href = "../../c_src/triangle_io/triangle_io.html">
TRIANGLE_IO</a>,
a C library which
can read or write some of the files created by Jonathan Shewchuk's
triangle() program.
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "fem_to_triangle.c">fem_to_triangle.c</a>,
the source code.
</li>
<li>
<a href = "fem_to_triangle.sh">fem_to_triangle.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<b>ELL</b> is an L-shaped region with 65 nodes and 96 elements.
<ul>
<li>
<a href = "ell_nodes.txt">ell_nodes.txt</a>,
the node coordinates in FEM format.
</li>
<li>
<a href = "ell_elements.txt">ell_elements.txt</a>,
the elements in FEM format.
</li>
<li>
<a href = "ell.node">ell.node</a>,
the node coordinates in TRIANGLE format.
</li>
<li>
<a href = "ell.ele">ell.ele</a>,
the elements in TRIANGLE format.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>MAIN</b> is the main program for FEM_TO_TRIANGLE.
</li>
<li>
<b>CH_CAP</b> capitalizes a single character.
</li>
<li>
<b>CH_EQI</b> is a case insensitive comparison of two characters for equality.
</li>
<li>
<b>CH_TO_DIGIT</b> returns the value of a base 10 digit.
</li>
<li>
<b>FILE_COLUMN_COUNT</b> counts the number of columns in the first line of a file.
</li>
<li>
<b>FILE_ROW_COUNT</b> counts the number of row records in a file.
</li>
<li>
<b>GET_UNIT</b> returns a free FORTRAN unit number.
</li>
<li>
<b>I4MAT_DATA_READ</b> reads data from an I4MAT file.
</li>
<li>
<b>I4MAT_HEADER_READ</b> reads the header from an I4MAT.
</li>
<li>
<b>I4MAT_TRANSPOSE_PRINT</b> prints an I4MAT, transposed.
</li>
<li>
<b>I4MAT_TRANSPOSE_PRINT_SOME</b> prints some of the transpose of an I4MAT.
</li>
<li>
<b>MESH_BASE_ZERO</b> ensures that the element definition is zero-based.
</li>
<li>
<b>R8MAT_DATA_READ</b> reads data from an R8MAT file.
</li>
<li>
<b>R8MAT_HEADER_READ</b> reads the header from an R8MAT file.
</li>
<li>
<b>R8MAT_TRANSPOSE_PRINT</b> prints an R8MAT, transposed.
</li>
<li>
<b>R8MAT_TRANSPOSE_PRINT_SOME</b> prints some of an R8MAT, transposed.
</li>
<li>
<b>S_TO_I4</b> reads an I4 from a string.
</li>
<li>
<b>S_TO_I4VEC</b> reads an I4VEC from a string.
</li>
<li>
<b>S_TO_R8</b> reads an R8 from a string.
</li>
<li>
<b>S_TO_R8VEC</b> reads an R8VEC from a string.
</li>
<li>
<b>S_WORD_COUNT</b> counts the number of "words" in a string.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
<li>
<b>TRIANGLE_ELEMENT_WRITE</b> writes a TRIANGLE ".ele" file.
</li>
<li>
<b>TRIANGLE_NODE_WRITE</b> writes a TRIANGLE ".node" file.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../c_src.html">
the C source codes</a>.
</p>
<hr>
<i>
Last revised on 14 October 2014.
</i>
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