TRIANGULATION_NODE_TO_ELEMENT\
Average Node Data to Create Element Data {#triangulation_node_to_element-average-node-data-to-create-element-data align=”center”}
========================================
TRIANGULATION_NODE_TO_ELEMENT is a C++ program which reads
datafiles describing a set of nodes, their triangulation, and the value
of one or more quantities at each node, and outputs a file that averages
the quantities for each element. This operation in effect creates an
“order1” finite element model of the data.
The program reads three data files:
- a node file, containing X, Y coordinates of points;
- an element file, containing a list of sets of three points making up
each triangular element; (if this file does not exist, the program
will generate the element data automatically).
- a node values file, containing the values of one or more data items
at each node.
and creates
- an element values file, containing the values of the data, averaged
over the nodes in each element.
Usage: {#usage align=”center”}
triangulation_node_to_element prefix
where
- prefix_nodes.txt, lists the node coordinates;
- prefix_elements.txt lists the indices of nodes that form elements
(this file is optional, and if not supplied, the information will be
generated internally);
- prefix_values.txt contains the value assigned to each node.
- prefix_element_values.txt will contain the values averaged over
the nodes in each element.
Licensing: {#licensing align=”center”}
The computer code and data files described and made available on this
web page are distributed under the GNU LGPL
license.
Languages: {#languages align=”center”}
TRIANGULATION_NODE_TO_ELEMENT is available in a C
version
and a C++
version
and a FORTRAN77
version
and a FORTRAN90
version
and a MATLAB
version.
TRIANGULATION, a C++
library which carries out various operations on order 3 (“linear”) or
order 6 (“quadratic”) triangulations.
TRIANGULATION_L2Q,
a C++ program which reads information about a 3-node (linear)
triangulation and creates data defining a corresponding 6-node
(quadratic) triangulation;
TRIANGULATION_Q2L,
a C++ program which reads information about a 6-node (quadratic)
triangulation and creates data defining a corresponding 3-node (linear)
triangulation;
Source Code: {#source-code align=”center”}
Examples and Tests: {#examples-and-tests align=”center”}
List of Routines: {#list-of-routines align=”center”}
- MAIN is the main program for TRIANGULATION_NODE_TO_ELEMENT.
- CH_CAP capitalizes a single character.
- CH_EQI is a case insensitive comparison of two characters for
equality.
- CH_TO_DIGIT returns the integer value of a base 10 digit.
- FILE_COLUMN_COUNT counts the number of columns in the first
line of a file.
- FILE_ROW_COUNT counts the number of row records in a file.
- I4MAT_DATA_READ reads data from an I4MAT file.
- I4MAT_HEADER_READ reads the header from an I4MAT.
- I4MAT_TRANSPOSE_PRINT_SOME prints some of the transpose of an
I4MAT.
- I4MAT_WRITE writes an I4MAT file.
- MESH_BASE_ONE ensures that the element definition is
one-based.
- R8MAT_DATA_READ reads data from an R8MAT file.
- R8MAT_HEADER_READ reads the header from an R8MAT file.
- R8MAT_TRANSPOSE_PRINT_SOME prints some of an R8MAT,
transposed.
- R8MAT_WRITE writes an R8MAT file.
- S_TO_I4 reads an I4 from a string.
- S_TO_I4VEC reads an I4VEC from a string.
- S_TO_R8 reads an R8 from a string.
- S_TO_R8VEC reads an R8VEC from a string.
- S_WORD_COUNT counts the number of “words” in a string.
- TIMESTAMP prints the current YMDHMS date as a time stamp.
You can go up one level to the C++ source codes.
Last revised on 09 April 2014.