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<html>
<head>
<title>
FEM2D_MESH_DISPLAY - Display a Finite Element Mesh
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
FEM2D_MESH_DISPLAY <br> Display a Finite Element Mesh
</h1>
<hr>
<p>
<b>FEM2D_MESH_DISPLAY</b>
is a MATLAB program which
plots the nodes and elements of a finite element mesh.
</p>
<p>
FEM2D_MESH_DISPLAY reads the FEM model of a mesh, that is, a file listing
the node coordinates and a file listing the indices of the nodes
that form each polygonal element. It displays the mesh, with
optional number of nodes or elements.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<blockquote>
<b>fem2d_mesh_display</b> ( <i>'prefix'</i>, <i>node_vis</i>, <i>element_vis</i> )
</blockquote>
where <i>'prefix'</i> is the common prefix for the node and element files:
<ul>
<li>
<i>'prefix'</i><b>_nodes.txt</b>, the node coordinates.
</li>
<li>
<i>'prefix'</i><b>_elements.txt</b>, the element file
</li>
</ul>
and <i>node_vis</i> is an integer defining the node visibility:
<ul>
<li>
<b>0</b>, do not show the nodes;
</li>
<li>
<b>1</b>, show the nodes;
</li>
<li>
<b>2</b>, show the nodes and label them.
</li>
</ul>
and <i>element_vis</i> is an integer defining the element visibility:
<ul>
<li>
<b>0</b>, do not show the element;
</li>
<li>
<b>1</b>, show the element;
</li>
<li>
<b>2</b>, show the element and color them.
</li>
<li>
<b>3</b>, show the element and color them, and label them.
</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>FEM2D_MESH_DISPLAY</b> is available in
<a href = "../../cpp_src/fem2d_mesh_display_opengl/fem2d_mesh_display_opengl.html">a C++ version</a> and
<a href = "../../m_src/fem2d_mesh_display/fem2d_mesh_display.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../m_src/bezier_surface_display/bezier_surface_display.html">
BEZIER_SURFACE_DISPLAY</a>,
a MATLAB program which
displays a Bezier surface;
</p>
<p>
<a href = "../../m_src/fem_basis_t3_display/fem_basis_t3_display.html">
FEM_BASIS_T3_DISPLAY</a>,
a MATLAB program which
displays a basis function associated with a linear triangle ("T3") mesh.
</p>
<p>
<a href = "../../m_src/fem_basis_t6_display/fem_basis_t6_display.html">
FEM_BASIS_T6_DISPLAY</a>,
a MATLAB program which
reads a quadratic triangle mesh and displays any associated basis function.
</p>
<p>
<a href = "../../m_src/fem2d_scalar_display/fem2d_scalar_display.html">
FEM2D_SCALAR_DISPLAY</a>,
a MATLAB program which
reads information about nodes, elements and nodal values for a
2D finite element method (FEM) and creates a surface plot of U(X,Y),
using the MATLAB graphics system.
</p>
<p>
<a href = "../../m_src/fem2d_scalar_display_gpl/fem2d_scalar_display_gpl.html">
FEM2D_SCALAR_DISPLAY_GPL</a>,
a MATLAB program which
reads information about nodes, elements and nodal values for a
2D finite element method (FEM) and creates a GPL file describing
a surface plot of U(X,Y), which can be displayed by gnuplot.
</p>
<p>
<a href = "../../examples/fenics_to_fem/fenics_to_fem.html">
FENICS_TO_FEM</a>,
examples which
illustrate how a mesh or scalar function computed by the FENICS program
can be written to FEM files, which can then be used to create
images, or as input to meshing programs or other analysis tools.
</p>
<p>
<a href = "../../m_src/grid_display/grid_display.html">
GRID_DISPLAY</a>,
a MATLAB library which
can display a 2D or 3D grid or sparse grid.
</p>
<p>
<a href = "../../m_src/gridlines/gridlines.html">
GRIDLINES</a>,
a MATLAB library which
gives the user more control over drawing gridlines on a graph
than the builtin "grid on" command.
</p>
<p>
<a href = "../../m_src/mpas_grid_display/mpas_grid_display.html">
MPAS_GRID_DISPLAY</a>,
a directory of MATLAB programs which
can read an MPAS NETCDF grid file and display the primary polygonal
mesh or the dual triangular mesh.
</p>
<p>
<a href = "../../m_src/ply_display/ply_display.html">
PLY_DISPLAY</a>,
a MATLAB program which
displays an image of a 3D graphics file in PLY format;
</p>
<p>
<a href = "../../m_src/polygonal_surface_display/polygonal_surface_display.html">
POLYGONAL_SURFACE_DISPLAY</a>,
a MATLAB program which
displays a surface in 3D described as a set of polygons;
</p>
<p>
<a href = "../../m_src/quad_surface_display/quad_surface_display.html">
QUAD_SURFACE_DISPLAY</a>,
a MATLAB program which
plots piecewise bilinear data associated with a QUAD_SURFACE, that is,
a 3D surface defined by a quadrilateral mesh;
</p>
<p>
<a href = "../../m_src/tet_mesh_display/tet_mesh_display.html">
TET_MESH_DISPLAY</a>,
ia MATLAB program which
reads in the node and tetra files defining a tet mesh and displays a wireframe
image.
</p>
<p>
<a href = "../../m_src/tri_surface_display/tri_surface_display.html">
TRI_SURFACE_DISPLAY</a>,
a MATLAB program which
reads data defining a triangular mesh
of a 3D surface and displays it.
</p>
<p>
<a href = "../../m_src/triangulation_display/triangulation_display.html">
TRIANGULATION_DISPLAY</a>,
a MATLAB program which
displays the nodes and elements of a triangulation on the MATLAB graphics screen;
</p>
<p>
<a href = "../../cpp_src/triangulation_display_opengl/triangulation_display_opengl.html">
TRIANGULATION_DISPLAY_OPENGL</a>,
a C++ program which
reads files defining a triangulation and displays an image using Open GL.
</p>
<p>
<a href = "../../m_src/triangulation_plot/triangulation_plot.html">
TRIANGULATION_PLOT</a>,
a MATLAB program which
plots a triangulation as a PostScript file.
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "fem2d_mesh_display.m">fem2d_mesh_display.m</a>
the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<b>DRAGON</b> is a mesh of hexagons.
<ul>
<li>
<a href = "dragon_nodes.txt">
dragon_nodes.txt</a>, the node coordinates.
</li>
<li>
<a href = "dragon_elements.txt">
dragon_elements.txt</a>, the nodes that form each element.
</li>
<li>
<a href = "dragon.png">
dragon.png</a>,
a PNG image of the mesh.
</li>
</ul>
</p>
<p>
<b>ELL</b> is an L-shaped region covered by triangles.
<ul>
<li>
<a href = "ell_nodes.txt">
ell_nodes.txt</a>, the node coordinates.
</li>
<li>
<a href = "ell_elements.txt">
ell_elements.txt</a>, the nodes that form each element.
</li>
<li>
<a href = "ell.png">
ell.png</a>,
a PNG image of the mesh.
</li>
</ul>
</p>
<p>
<b>RECT</b> is a rectangular region covered by quadrilaterals.
<ul>
<li>
<a href = "rect_nodes.txt">
rect_nodes.txt</a>, the node coordinates.
</li>
<li>
<a href = "rect_elements.txt">
rect_elements.txt</a>, the nodes that form each element.
</li>
<li>
<a href = "rect.png">
rect.png</a>,
a PNG image of the mesh.
</li>
</ul>
</p>
<p>
<b>Q4</b> is a rectangular region covered by quadrilaterals, with a hole.
<ul>
<li>
<a href = "q4_nodes.txt">
q4_nodes.txt</a>, the node coordinates.
</li>
<li>
<a href = "q4_elements.txt">
q4_elements.txt</a>, the nodes that form each element.
</li>
<li>
<a href = "q4.png">
q4.png</a>,
a PNG image of the mesh.
</li>
</ul>
</p>
<p>
<b>HEX</b> is a mesh of hexagons.
<ul>
<li>
<a href = "hex_nodes.txt">
hex_nodes.txt</a>, the node coordinates.
</li>
<li>
<a href = "hex_elements.txt">
hex_elements.txt</a>, the nodes that form each element.
</li>
<li>
<a href = "hex.png">
hex.png</a>,
a PNG image of the mesh.
</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 12 October 2014.
</i>
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