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<html>
<head>
<title>
FEM_IO - Read or Write a Finite Element Model
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
FEM_IO <br> Read or Write a Finite Element Model
</h1>
<hr>
<p>
<b>FEM_IO</b>
is a C++ library which
reads or writes FEM files,
which describe the nodes, elements, and function values
associated with a finite element method (FEM) model;
</p>
<p>
The finite element model is assumed to include three items:
<ul>
<li>
Node coordinates;
</li>
<li>
Elements defined by a sequence of node indices;
</li>
<li>
Node data;
</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_IO</b> is available in
<a href = "../../c_src/fem_io/fem_io.html">a C version</a> and
<a href = "../../cpp_src/fem_io/fem_io.html">a C++ version</a> and
<a href = "../../f77_src/fem_io/fem_io.html">a FORTRAN77 version</a> and
<a href = "../../f_src/fem_io/fem_io.html">a FORTRAN90 version</a> and
<a href = "../../m_src/fem_io/fem_io.html">a MATLAB version.</a>
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../m_src/fem_display/fem_display.html">
FEM_DISPLAY</a>,
a MATLAB program which
reads the FEM model of a 2D mesh, consisting of polygonal elements of
any uniform order, and displays an image of the elements and nodes,
with optional numbering.
</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 = "../../cpp_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/fem1d/fem1d.html">
FEM1D</a>,
a data directory which
contains examples of 1D FEM files,
three text files that describe a 1D finite element model;
</p>
<p>
<a href = "../../data/fem2d/fem2d.html">
FEM2D</a>,
a data directory which
contains examples of 2D FEM files,
three text files that describe a 2D finite element geometry;
</p>
<p>
<a href = "../../cpp_src/fem2d_pack/fem2d_pack.html">
FEM2D_PACK</a>,
a C++ library which
is useful for 2D finite element calculations.
</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;
</p>
<p>
<a href = "../../cpp_src/gmsh_to_fem/gmsh_to_fem.html">
GMSH_TO_FEM</a>,
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>
<p>
<a href = "../../cpp_src/medit_io/medit_io.html">
MEDIT_IO</a>,
a C++ library which
can read or write MEDIT mesh files, which can be used to define the geometry
of a finite element mesh in 2D or 3D, using triangles, quadrilaterals,
tetrahedrons or hexahedrons.
</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/table_io/table_io.html">
TABLE_IO</a>,
a C++ library which
can read and write TABLE files.
</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>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Hans Rudolf Schwarz,<br>
Finite Element Methods,<br>
Academic Press, 1988,<br>
ISBN: 0126330107,<br>
LC: TA347.F5.S3313..
</li>
<li>
Gilbert Strang, George Fix,<br>
An Analysis of the Finite Element Method,<br>
Cambridge, 1973,<br>
ISBN: 096140888X,<br>
LC: TA335.S77.
</li>
<li>
Olgierd Zienkiewicz,<br>
The Finite Element Method,<br>
Sixth Edition,<br>
Butterworth-Heinemann, 2005,<br>
ISBN: 0750663200,<br>
LC: TA640.2.Z54
</li>
<li>
Daniel Zwillinger, editor,<br>
CRC Standard Mathematical Tables and Formulae,<br>
30th Edition,<br>
CRC Press, 1996,<br>
ISBN: 0-8493-2479-3.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "fem_io.cpp">fem_io.cpp</a>, the source code.
</li>
<li>
<a href = "fem_io.hpp">fem_io.hpp</a>, the include file.
</li>
<li>
<a href = "fem_io.sh">fem_io.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<b>FEM_IO_PRB</b> is a test program which tests the routines
that read and write finite element data.
<ul>
<li>
<a href = "fem_io_prb.cpp">fem_io_prb.cpp</a>
is the source code of the tests.
</li>
<li>
<a href = "fem_io_prb.sh">fem_io_prb.sh</a> runs all the tests.
</li>
<li>
<a href = "fem_io_prb_output.txt">fem_io_prb_output.txt</a>
the output file.
</li>
</ul>
</p>
<p>
<b>ELL</b> is an example of a 2D finite element model
in which a scalar value is stored.
<ul>
<li>
<a href = "ell_nodes.txt">ell_nodes.txt</a>
</li>
<li>
<a href = "ell_elements.txt">ell_elements.txt</a>
</li>
<li>
<a href = "ell_values.txt">ell_values.txt</a>
</li>
</ul>
</p>
<p>
<b>P01</b> is a 3D rectangular channel, with dimensions 1x1x3,
using 584 nodes and 2568 elements. This data was created by DISTMESH.
<ul>
<li>
<a href = "p01_nodes.txt">p01_nodes.txt</a>
</li>
<li>
<a href = "p01_elements.txt">p01_elements.txt</a>
</li>
<li>
<a href = "p01_values.txt">p01_values.txt</a>
</li>
</ul>
</p>
<p>
<b>TINY</b> is a "tiny" example of a 2D finite element model
in which a vector value is stored. This data was written
by the FEM_WRITE routine.
<ul>
<li>
<a href = "tiny_nodes.txt">tiny_nodes.txt</a>
</li>
<li>
<a href = "tiny_elements.txt">tiny_elements.txt</a>
</li>
<li>
<a href = "tiny_values.txt">tiny_values.txt</a>
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<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>FEM_DATA_READ</b> reads data from a set of FEM files.
</li>
<li>
<b>FEM_HEADER_PRINT</b> prints the header to set of FEM files.
</li>
<li>
<b>FEM_HEADER_READ</b> reads the sizes of arrays in a set of FEM files.
</li>
<li>
<b>FEM_WRITE</b> writes data files associated with a finite element solution.
</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>I4_MAX</b> returns the maximum of two integers.
</li>
<li>
<b>I4_MIN</b> returns the smaller of two integers.
</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>ITABLE_DATA_READ</b> reads data from an integer TABLE file.
</li>
<li>
<b>ITABLE_DATA_WRITE</b> writes data to an integer TABLE file.
</li>
<li>
<b>ITABLE_HEADER_READ</b> reads the header from an integer TABLE file.
</li>
<li>
<b>ITABLE_HEADER_WRITE</b> writes the header of an integer TABLE file.
</li>
<li>
<b>R8_EPSILON</b> returns the roundoff unit for R8's.
</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>R8TABLE_DATA_READ</b> reads the data from an R8TABLE file.
</li>
<li>
<b>R8TABLE_DATA_WRITE</b> writes data to an R8TABLE file.
</li>
<li>
<b>R8TABLE_HEADER_READ</b> reads the header from an R8TABLE file.
</li>
<li>
<b>R8TABLE_HEADER_WRITE</b> writes the header of an R8TABLE file.
</li>
<li>
<b>S_BLANK_DELETE</b> removes blanks from a string, left justifying the remainder.
</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 a real vector 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>TIMESTRING</b> returns the current YMDHMS date as a string.
</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 10 November 2006.
</i>
<!-- John Burkardt -->
</body>
</html>