Partial Differential Equation Toolbox

Mesh Menu

Mesh Mode	Enter mesh mode.
Initialize Mesh	Build and display an initial triangular mesh.
Refine Mesh	Uniformly refine the current triangular mesh.
Jiggle Mesh	Jiggle the mesh.
Undo Mesh Change	Undo the last mesh change. All mesh generations are saved, so repeated Undo Mesh Change eventually brings you back to the initial mesh.
Display Triangle Quality	Display a plot of the triangular mesh where the individual triangles are colored according to their quality. The quality measure is a number between 0 and 1, where triangles with a quality measure greater than 0.6 are acceptable. For details on the triangle quality measure, see pdetriq.
Show Node Labels	Toggle the mesh node labels on/off. The node labels are the column numbers in the Point matrix p.
Show Triangle Labels	Toggle the mesh triangle labels on/off. The triangle labels are the column numbers in the triangle matrix t.
Parameters . . .	Open dialog box for modification of mesh generation parameters.
Export Mesh . . .	Export Point matrix p, Edge matrix e, and Triangle matrix t to the main workspace.

Parameters . . .

Parameters . . . opens a dialog box containing mesh generation parameters. The parameters used by the mesh initialization algorithm initmesh are

• Maximum edge size: Largest triangle edge length (approximately). This parameter is optional and must be a real positive number.
• Mesh growth rate: The rate at which the mesh size increases away from small parts of the geometry. The value must be between 1 and 2. The default value is 1.3, i.e., the mesh size increases by 30%.
• Jiggle mesh: Toggles automatic jiggling of the initial mesh on/off.

The parameters used by the mesh jiggling algorithm jigglemesh are

• Jiggle mode: Select a jiggle mode from a pop-up menu. Available modes are on, optimize minimum, and optimize mean. on jiggles the mesh once. Using the jiggle mode optimize minimum, the jiggling process is repeated until the minimum triangle quality stops increasing or until the iteration limit is reached. The same applies for the optimize mean option, but it tries to increase the mean triangle quality.
• Number of jiggle iterations: Iteration limit for the optimize minimum and optimize mean modes. Default: 20.

Finally, for the mesh refinement algorithm refinemesh, the Refinement method can be regular or longest. The default refinement method is regular, which results in a uniform mesh. The refinement method longest always refines the longest edge on each triangle.

PDE Menu

Solve Menu