GNU Octave Manual Version 3 by John W. Eaton, David Bateman, Søren Hauberg Paperback (6"x9"), 568 pages ISBN 095461206X RRP £24.95 ($39.95) Get a printed copy>>>

GNU Octave Manual Version 3 Buy the book here >>> support free documentation

28.1.1 Plotting the Triangulation

Octave has the functions triplot and trimesh to plot the Delaunay triangulation of a 2-dimensional set of points.

Function File: triplot (tri, x, y)

Function File: triplot (tri, x, y, linespec)

Function File: h = triplot (...)

Plot a triangular mesh in 2D. The variable tri is the triangular meshing of the points (x, y) which is returned from delaunay. If given, the linespec determines the properties to use for the lines. The output argument h is the graphic handle to the plot.

See also plot, trimesh, delaunay

Function File: trimesh (tri, x, y, z)

Function File: h = trimesh (...)

Plot a triangular mesh in 3D. The variable tri is the triangular meshing of the points (x, y) which is returned from delaunay. The variable z is value at the point (x, y). The output argument h is the graphic handle to the plot.

See also triplot, delaunay3

The difference between triplot and trimesh is that the former only plots the 2-dimensional triangulation itself, whereas the second plots the value of some function f (x, y). An example of the use of the triplot function is

rand ("state", 2)
x = rand (20, 1);
y = rand (20, 1);
tri = delaunay (x, y);
triplot (tri, x, y);

that plot the Delaunay triangulation of a set of random points in 2-dimensions.