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<html>
<head>
<title>
FEM_TO_MEDIT - Convert finite element mesh data from FEM to MEDIT format
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
FEM_TO_MEDIT <br> Convert finite element mesh data from FEM to MEDIT format
</h1>
<hr>
<p>
<b>FEM_TO_MEDIT</b>
is a MATLAB program which
reads a pair of FEM files defining the node coordinates and elements
of a finite element mesh, and rewrites the data as a MEDIT file.
</p>
<p>
The program can convert 2D meshes of triangles, or 3D meshes of
tetrahedrons.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<blockquote>
<b>fem_to_medit</b> prefix
</blockquote>
where <i>prefix</i> is the file name prefix, so that:
<ul>
<li>
<i>prefix</i><b>_nodes.txt</b> is a file containing node coordinates;
</li>
<li>
<i>prefix</i><b>_elements.txt</b> is a file listing the nodes
forming each element;
</li>
<li>
<i>prefix</i><b>_boundary_node_mask.txt</b> is a file listing a "0" for
each interior node and a "1" for each boundary node; (This file can
be created by the <b>triangulation_boundary_nodes</b> or
<b>tet_mesh_boundary</b> programs.)
</li>
<li>
<i>prefix</i><b>.mesh</b> is the name of the MEDIT file to be created.
</li>
</ul>
</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>FEM_TO_MEDIT</b> is available in
<a href = "../../c_src/fem_to_medit/fem_to_medit.html">a C version</a> and
<a href = "../../cpp_src/fem_to_medit/fem_to_medit.html">a C++ version</a> and
<a href = "../../f77src/fem_to_medit/fem_to_medit.html">a FORTRAN77 version</a> and
<a href = "../../f_src/fem_to_medit/fem_to_medit.html">a FORTRAN90 version</a> and
<a href = "../../m_src/fem_to_medit/fem_to_medit.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../m_src/fem_to_gmsh/fem_to_gmsh.html">
FEM_TO_GMSH</a>,
a MATLAB 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 = "../../m_src/fem_to_triangle/fem_to_triangle.html">
FEM_TO_TRIANGLE</a>,
a MATLAB program which
reads FEM files defining a 2D mesh of triangles, namely
a file of node coordinates and a file of elements defined by
node indices, and creates a corresponding pair of node
and element files for use by Jonathan Shewchuk's triangle program.
</p>
<p>
<a href = "../../m_src/fem_to_xml/fem_to_xml.html">
FEM_TO_XML</a>,
a MATLAB 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 finite element geometry
and associated nodal values;
</p>
<p>
<a href = "../../data/fem3d/fem3d.html">
FEM3D</a>,
a data directory which
contains examples of 3D FEM files,
three text files that describe a 3D finite element geometry
and associated nodal values.
</p>
<p>
<a href = "../../data/medit/medit.html">
MEDIT</a>,
a data directory which
contains examples of files which can be used by the MEDIT program
to define a 2D or 3D mesh for use by the finite element method (FEM),
using triangles, quadrilaterals, tetrahedrons or hexahedrons.
</p>
<p>
<a href = "../../examples/medit/medit.html">
MEDIT</a>,
examples which
illustrate the use of medit, an interactive graphics program developed
to visualize numerical simulation results on unstructured meshes in
two and three dimensions. Scalar, vector and tensor fields can be
easily associated and displayed with meshes.
The program is by Pascal Frey.
</p>
<p>
<a href = "../../m_src/medit_to_fem/medit_to_fem.html">
MEDIT_TO_FEM</a>,
a MATLAB program which
reads a mesh file created by the MEDIT program
and writes a corresponding pair of node and element files that correspond
to the FEM format.
</p>
<p>
<a href = "../../m_src/triangle_to_medit/triangle_to_medit.html">
TRIANGLE_TO_MEDIT</a>,
a MATLAB program which reads the NODE and ELE files created by triangle() to
describe a triangular mesh, and writes a corresponding MESH file
for input to medit().
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Pascal Frey,<br>
MEDIT: An interactive mesh visualization software,<br>
Technical Report RT-0253,<br>
Institut National de Recherche en Informatique et en Automatique,<br>
03 December 2001.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "fem_to_medit.m">fem_to_medit.m</a>, the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<b>ELL</b> is a 2D L-shaped region, with a grid of 65 nodes
and 96 elements of order 3 triangles.
<ul>
<li>
<a href = "../../data/fem2d/ell_nodes.txt">ell_nodes.txt</a>
</li>
<li>
<a href = "../../data/fem2d/ell_elements.txt">ell_elements.txt</a>
</li>
<li>
<a href = "../../data/fem2d/ell_elements.png">ell_elements.png</a>,
an image of the triangulation.
</li>
<li>
<a href = "../../data/fem2d/ell_boundary_node_mask.txt">ell_boundary_node_mask.txt</a>
</li>
<li>
<a href = "../../data/mesh/ell.mesh">ell.mesh</a>, the MEDIT file.
</li>
</ul>
</p>
<p>
<b>P01</b> is 3D FEM data for a rectangular channel of dimensions
3x1x1 physical units, using 584 nodes and 2568 tetrahedral elements.
<ul>
<li>
<a href = "../../data/fem3d/p01_nodes.txt">p01_nodes.txt</a>,
defines the FEM nodes.
</li>
<li>
<a href = "../../data/fem3d/p01_elements.txt">p01_elements.txt</a>,
defines the FEM elements.
</li>
<li>
<a href = "../../data/fem3d/p01.png">p01.png</a>,
an image of the mesh.
</li>
<li>
<a href = "../../data/fem3d/p01_boundary_node_mask.txt">p01_boundary_node_mask.txt</a>
</li>
<li>
<a href = "../../data/mesh/p01.mesh">p01.mesh</a>, the MEDIT file.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../m_src.html">
the MATLAB source codes</a>.
</p>
<hr>
<i>
Last revised on 10 October 2014.
</i>
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