FEM2D_SCALAR_DISPLAY_BRIEF
Surface Plot of Scalar FEM2D Data

FEM2D_SCALAR_DISPLAY_BRIEF, a MATLAB program which reads datafiles describing a set of nodes, their triangulation, and the value of a scalar quantity at each node, and creates a graphics file of the corresponding surface plot, which is then displayed using the MATLAB graphics system, using just 5 lines of code.

The program reads three data files:

prefix_nodes.txt, a node file, containing X, Y coordinates of points;
prefix_elements.txt, an element file, containing a list of sets of three points making up each triangular element.
prefix_values.txt, a values file, containing the values of a scalar function U(X,Y) evaluated at each node.

Usage:

fem2d_scalar_display_brief ( 'prefix' )

where 'prefix' is the common prefix for the node, element and value files:

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

FEM2D_SCALAR_DISPLAY is available in a MATLAB version.

Related Data and Programs:

DIST_PLOT, a MATLAB program which makes contour plots of the distance function, as defined and used in Persson and Strang's distmesh code;

FEM2D_MESH_DISPLAY, 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.

FEM2D_SCALAR_DISPLAY, 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.

fem2d_scalar_display_brief_test

FEM2D_SCALAR_DISPLAY_GPL, 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.

FENICS_TO_FEM, 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.

TRIANGULATION_ORDER3_CONTOUR, a MATLAB program which can display a contour plot of scalar data defined on a triangulation of order 3.

Source Code:

fem2d_scalar_display_txyv.m, reads files (x,y) and v and plots v(x,y);
fem2d_scalar_display_txyz.m, reads a file (x,y,z) and plots the surface z(x,y);
timestamp.m, prints the YMDHMS date as a timestamp.