COMSOL Multiphysics™

geomgroup
Purpose
geomgroup
Groups geometry objects into an assembly.
Syntax [g, ...] = geomgroup(gl, ...)
[g, ...] = geomgroup(draw, ...)
[g, ...] = geomgroup(fem, ...)
Description
[g, ...] = geomgroup(gl, ...) creates an assembly object g from the geometry
objects in the cell array gl.
[g, ...] = geomgroup(draw, ...) creates an assembly object g from the
geometry objects in the draw struct draw.
[g, ...] = geomgroup(fem, ...) creates an assembly object g from the
geometry objects in the draw struct fem.draw.
Note that the parts of assembly g are not identical to gl. They are canonized and
may have additional domains due to imprints.
The function supports the following properties:
TABLE 1-62: VALID PROPERTY/VALUE PAIRS
PROPERTY
NAME
PROPERTY VALUE DEFAULT DESCRIPTION
Imprint on | off on Make imprints, when creating pair
information
Ns
cell array of
strings
{} Name space
Out
cell array of
strings
Paircand all | none |
cell array of
strings
{’g’}
all
Cell array of strings: g, gt, st,
ft, ct, pt, stx, ftx, ctx,
ptx, pairs
Specifies the geometries which are
used to create the pair information
Repairtol positive scalar 0.0 Tolerance used for repairing gaps.
Note: If the first syntax from above is used and the property paircand is a cell array
of strings, also the property ns has to be specified.
The output pairs is a cell array of sparse matrices containing the pair information
of the operation. Element i contains information for pairs of domains of dimension
i-1. The column refers to the source and the row to the destination.
The output gt is a sparse matrix that relates the parts in the assembly to the original
geometry objects. If an object has not been modified during the operation the value
in gt is 1, otherwise 2.
220 | CHAPTER 1: COMMAND REFERENCE