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<html>
<head>
<title>
FEM_TO_XML - Convert Mesh Data from FEM to DOLFIN XML Format
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
FEM_TO_XML <br> Convert Mesh Data from FEM to DOLFIN XML Format
</h1>
<hr>
<p>
<b>FEM_TO_XML</b>
is a C++ program which
reads FEM files of node coordinates and element connectivity,
which define a mesh of a 1D, 2D, or 3D region
and creates a corresponding DOLFIN XML file.
</p>
<p>
These mesh files can be used as input to DOLFIN or FENICS.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<blockquote>
<b>fem_to_xml</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>.xml will contain the DOLFIN XML mesh 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_XML</b> is available in
<a href = "../../c_src/fem_to_xml/fem_to_xml.html">a C version</a> and
<a href = "../../cpp_src/fem_to_xml/fem_to_xml.html">a C++ version</a> and
<a href = "../../f77_src/fem_to_xml/fem_to_xml.html">a FORTRAN77 version</a> and
<a href = "../../f_src/fem_to_xml/fem_to_xml.html">a FORTRAN90 version</a> and
<a href = "../../m_src/fem_to_xml/fem_to_xml.html">a MATLAB version</a> and
<a href = "../../py_src/fem_to_xml/fem_to_xml.html">a Python 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 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_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 = "../../cpp_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 = "../../cpp_src/fem_to_triangle/fem_to_triangle.html">
FEM_TO_TRIANGLE</a>,
a C++ 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 = "../../examples/fenics/fenics.html">
FENICS</a>,
programs which
illustrate the use of a collection of free software
with an extensive list of features for
automated, efficient solution of differential equations.
</p>
<p>
<a href = "../../examples/mitchell_fenics/mitchell_fenics.html">
MITCHELL_FENICS</a>,
examples which
illustrate the implementation of the Mitchell 2D elliptic
partial differential equation (PDE) test problems using FENICS.
</p>
<p>
<a href = "../../cpp_src/tet_mesh/tet_mesh.html">
TET_MESH</a>,
a C++ library which
carries out various operations on tetrahedral meshes.
</p>
<p>
<a href = "../../cpp_src/triangulation/triangulation.html">
TRIANGULATION</a>,
a C++ library which
performs various operations on order 3 (linear) or order 6 (quadratic)
triangulations.
</p>
<p>
<a href = "../../data/xml/xml.html">
XML</a>,
a data directory which
contains examples of XML files,
a standard, general datafile 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">
Reference:
</h3>
<p>
<ol>
<li>
Anders Logg, Kent-Andre Mardal, Garth Wells,<br>
Automated Solution of Differential Equations by the Finite Element
Method: The FEniCS Book,<br>
Lecture Notes in Computational Science and Engineering,<br>
Springer, 2011,<br>
ISBN13: 978-3642230981,<br>
LC:
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "fem_to_xml.cpp">fem_to_xml.cpp</a>,
the source code.
</li>
<li>
<a href = "fem_to_xml.sh">fem_to_xml.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<b>BATTERY</b> is a rectangular region which was subdivided into 7
faces which were meshed together by MESHFACES.
<ul>
<li>
<a href = "battery_nodes.txt">battery_nodes.txt</a>,
the node coordinates.
</li>
<li>
<a href = "battery_elements.txt">battery_elements.txt</a>,
the elements.
</li>
<li>
<a href = "battery.png">battery.png</a>,
a PNG image of the triangulation.
</li>
<li>
<a href = "battery.xml">battery.xml</a>,
the corresponding DOLFIN XML mesh file.
</li>
</ul>
</p>
<p>
<b>CHANNEL/b> is a 3D region, [0,3]x[0,1]x[0,1] [-1,+1],
containing 63 nodes and 144 elements.
<ul>
<li>
<a href = "channel_nodes.txt">channel_nodes.txt</a>,
the node coordinates.
</li>
<li>
<a href = "channel_elements.txt">channel_elements.txt</a>,
the elements.
</li>
<li>
<a href = "channel.xml">channel.xml</a>,
the corresponding DOLFIN XML mesh file.
</li>
</ul>
</p>
<p>
<b>CHEBY9</b> is a 1D interval, [-1,+1], containing 9 nodes and 8 elements.
<ul>
<li>
<a href = "cheby9_nodes.txt">cheby9_nodes.txt</a>,
the node coordinates.
</li>
<li>
<a href = "cheby9_elements.txt">cheby9_elements.txt</a>,
the elements.
</li>
<li>
<a href = "cheby9.xml">cheby9.xml</a>,
the corresponding DOLFIN XML mesh file.
</li>
</ul>
</p>
<p>
<b>CIRCLE</b> is a 2D circular region which was meshed by MESH2D.
<ul>
<li>
<a href = "circle_nodes.txt">circle_nodes.txt</a>,
the node coordinates.
</li>
<li>
<a href = "circle_elements.txt">circle_elements.txt</a>,
the elements.
</li>
<li>
<a href = "circle.png">circle.png</a>,
a PNG image of the triangulation.
</li>
<li>
<a href = "circle.xml">circle.xml</a>,
the corresponding DOLFIN XML mesh file.
</li>
</ul>
</p>
<p>
<b>RECTANGLE</b> is a rectangular region which has been divided
into 3 rows and 4 columns of squares, each then split into two
3-node triangles.
<ul>
<li>
<a href = "rectangle_nodes.txt">rectangle_nodes.txt</a>,
the node coordinates.
</li>
<li>
<a href = "rectangle_elements.txt">rectangle_elements.txt</a>,
the elements.
</li>
<li>
<a href = "rectangle.png">rectangle.png</a>,
a PNG image of the triangulation, created by TRIANGULATION_PLOT.
</li>
<li>
<a href = "rectangle.xml">rectangle.xml</a>,
the corresponding DOLFIN XML mesh file.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>MAIN</b> is the main program for FEM_TO_XML.
</li>
<li>
<b>CH_CAP</b> capitalizes a single character.
</li>
<li>
<b>CH_EQI</b> is true if two characters are equal, disregarding case.
</li>
<li>
<b>CH_TO_DIGIT</b> returns the integer value of a base 10 digit.
</li>
<li>
<b>FILE_COLUMN_COUNT</b> counts the 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>I4_MAX</b> returns the maximum of two I4's.
</li>
<li>
<b>I4_MIN</b> returns the minimum of two I4's.
</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 file.
</li>
<li>
<b>I4MAT_TRANSPOSE_PRINT</b> prints an I4MAT, transposed.
</li>
<li>
<b>I4MAT_TRANSPOSE_PRINT_SOME</b> prints some of an I4MAT, transposed.
</li>
<li>
<b>MESH_BASE_ZERO</b> ensures that the element definition is zero-based.
</li>
<li>
<b>R8MAT_DATA_READ</b> reads the 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_LEN_TRIM</b> returns the length of a string to the last nonblank.
</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>XML_WRITE</b> writes the triangulation data as a DOLFIN XML mesh file.
</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 06 October 2014.
</i>
<!-- John Burkardt -->
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