COMSOL Multiphysics™

postcrossplot
Purpose
postcrossplot
Cross-section plot.
Syntax
Description
postcrossplot(fem,cdim,dom,...)
h = postcrossplot(fem,cdim,dom,...)
[h,data] = postcrossplot(fem,cdim,dom,...)
postcrossplot(fem,cdim,dom,...) displays a plot of an expression, including a
FEM solution, in one or several cross sections of the geometry, with space
dimension cdim and defined by dom (coordinates) or on mesh elements of space
dimension cdim, specified by dom (domain list). The argument dom is therefore
either a number of points to specify a cross section or a list of domains. To specify a
cross section, dom must be one of the following, where sdim denotes the space
dimension of the geometry:
• An sdim-by-2 matrix to specify a cross-section line (the line between the two
points in the columns of dom) in 2D and 3D. Used with properties lindata and
surfdata. Here, cdim must be 1.
• A 3-by-3 matrix to specify a cross-section plane (the plane containing all three
points in the columns of dom) in 3D. Used with property surfdata. Here, cdim
must be 2.
• An sdim-by-np matrix to specify np points for point plots. Used with property
pointdata. Here, cdim must be 0.
To specify a list of domains (geometry vertices, geometry edges, geometry
boundaries, or geometry subdomains), dom must be:
• A 1-by-nd integer matrix, where nd is the number of domains with space
dimension cdim (vertices, edges, boundaries, or subdomains) to plot on. When
used with surfdata in 3D, nd must be one.
In 1D, if all entries in dom are integers greater than or equal to 1, they are interpreted
as indices to geometry vertices. Otherwise, they are interpreted as coordinates. To
specify a coordinate which is an integer greater than or equal to 1, use the property
pointtype set to coord.
The expressions that are plotted can be COMSOL Multiphysics expressions
involving variables, in particular application mode variables.
The following plot types can be made:
Point plots (1D, 2D, 3D) Plot of an expression on any geometry vertex or arbitrary
point in the subdomains of the geometry. This is most useful when there are several
solutions, in which case this plot shows the value of the expression in the selected
326 | CHAPTER 1: COMMAND REFERENCE