forked from johannesgerer/jburkardt-cpp
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathfem_to_medit.html
333 lines (295 loc) · 9.48 KB
/
fem_to_medit.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
<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 C++ program which
reads a set of FEM files defining the node coordinates, boundary nodes,
and elements of a finite element mesh, and rewrites the data as a MEDIT mesh 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>_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>_elements.txt</b> is a file listing the nodes
forming each element;
</li>
<li>
<i>prefix</i><b>.mesh</b> is the name of the MEDIT mesh 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 = "../../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_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/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 = "../../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_medit/triangle_to_medit.html">
TRIANGLE_TO_MEDIT</a>,
a C++ 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.cpp">fem_to_medit.cpp</a>, the source code.
</li>
<li>
<a href = "fem_to_medit.sh">fem_to_medit.sh</a>,
BASH commands to compile 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 MESH 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 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_MEDIT.
</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>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>MESH_WRITE</b> writes mesh data to a MESH file.
</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>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>
</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 October 2014.
</i>
<!-- John Burkardt -->
</body>
<!-- Initial HTML skeleton created by HTMLINDEX. -->
</html>