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<html>
<head>
<title>
GMSH_TO_FEM - Convert Mesh Data from GMSH to FEM Format.
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
GMSH_TO_FEM <br> Convert Mesh Data from GMSH to FEM Format.
</h1>
<hr>
<p>
<b>GMSH_TO_FEM</b>
is a C++ program which
reads a mesh data file created by the GMSH program
and writes a pair of node and element files that correspond
to the FEM format.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<blockquote>
<b>gmsh_to_fem</b> <i>prefix</i>
</blockquote>
where <i>prefix</i> is the common filename prefix so that:
<ul>
<li>
<i>prefix</i><b>.msh</b> contains the GMSH mesh data file.
</li>
<li>
<i>prefix</i><b>_nodes.txt</b> will be the FEM node file created by the program.
</li>
<li>
<i>prefix</i><b>_elements.txt</b> will be the FEM element file created by the program.
</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>GMSH_TO_FEM</b> is available in
<a href = "../../c_src/gmsh_to_fem/triangle_to_fem.html">a C version</a> and
<a href = "../../cpp_src/triangle_to_fem/triangle_to_fem.html">a C++ version</a> and
<a href = "../../f77_src/triangle_to_fem/triangle_to_fem.html">a FORTRAN77 version</a> and
<a href = "../../f_src/triangle_to_fem/triangle_to_fem.html">a FORTRAN90 version</a> and
<a href = "../../m_src/triangle_to_fem/triangle_to_fem.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../py_src/dolfin-convert/dolfin-convert.html">
DOLFIN-CONVERT</a>,
a Python program which
can convert a mesh file from Gmsh, MEDIT, METIS or SCOTCH format to an
XML format suitable for use by DOLFIN or FENICS,
by Anders Logg.
</p>
<p>
<a href = "../../cpp_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 = "../../cpp_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 = "../../data/fem2d/fem2d.html">
FEM2D</a>,
a data directory which
contains examples of 2D FEM files, a pair of files defining the coordinates
of nodes, and the nodes that form triangular elements.
</p>
<p>
<a href = "../../examples/gmsh/gmsh.html">
GMSH</a>,
examples which
illustrate the use of the Gmsh program,
a 1D, 2D or 3D mesh generator that can create meshes
suitable for use by the finite element method (FEM).
</p>
<p>
<a href = "../../cpp_src/gmsh_io/gmsh_io.html">
GMSH_IO</a>,
a C++ library which
can read or write some of the files created by the Gmsh
program for 1D, 2D or 3D meshes used by the finite element method (FEM).
</p>
<p>
<a href = "../../cpp_src/medit_to_fem/medit_to_fem.html">
MEDIT_TO_FEM</a>,
a C++ 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 = "../../cpp_src/triangle_to_fem/triangle_to_fem.html">
TRIANGLE_TO_FEM</a>,
a C++ program which reads the NODE and ELE files created by
triangle() to describe a triangular mesh, and writes a corresponding
pair of node and element files in the 2D FEM format.
</p>
<p>
<a href = "../../py_src/xml_to_fem/xml_to_fem.html">
XML_TO_FEM</a>,
a Python program which
reads an XML file created by FENICS or DOLFIN, describing a mesh
in 1D, 2D, or 3D, and creates corresponding FEM files, namely,
a file of node coordinates, and a file of element connectivities.
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "gmsh_to_fem.cpp">gmsh_to_fem.cpp</a>, the source code.
</li>
<li>
<a href = "gmsh_to_fem.sh">gmsh_to_fem.sh</a>,
BASH commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "example_2d.msh">example_2d.msh</a>,
a sample 2D GMSH mesh file.
</li>
<li>
<a href = "example_2d_nodes.txt">example_2d_nodes.txt</a>,
the FEM node file created by the program.
</li>
<li>
<a href = "example_2d_elements.txt">example_2d_elements.txt</a>,
the FEM element file created by the program.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>MAIN</b> is the main program for GMSH_TO_FEM.
</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 integer value of a base 10 digit.
</li>
<li>
<b>GMSH_DATA_READ</b> reads sizes from a GMSH file.
</li>
<li>
<b>GMSH_SIZE_READ</b> reads sizes from a GMSH file.
</li>
<li>
<b>I4MAT_WRITE</b> writes an I4MAT file.
</li>
<li>
<b>R8MAT_WRITE</b> writes an R8MAT file.
</li>
<li>
<b>S_BEGIN</b> is TRUE if one string matches the beginning of the other.
</li>
<li>
<b>S_TO_I4</b> reads an I4 from a string.
</li>
<li>
<b>S_TO_R8</b> reads an R8 from a string.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</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 21 October 2014.
</i>
<!-- John Burkardt -->
</body>
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</html>