COMSOL 6.2 - Eigenvalue

model.study(stdname).create(fname, "Eigenvalue");

model.study(stdname).feature(fname).set(pname,value);

The following properties are available.

Table 6-118: Properties for Study Settings.
Property	Value	Default	Description
appnreigs	Integer	20	Approximate number of eigenvalues.
chkeigregion	on \| off	on	Perform consistency check.
eigli	Real scalar	0	Largest imaginary part.
eiglr	Real scalar	0	Largest real part.
eigmethod	manual \| region \| all	manual	Eigenvalue search method; the all method finds all eigenvalues for a full matrix and can only be used for small eigenvalue problems.
eigsi	Real scalar	0	Smallest imaginary part.
eigsr	Real scalar	0	Smallest real part.
eigwhich	lm \| lr \| sr \| li \| si	lm	Eigenfrequency search method around shift.
linplistsolnum	integer array		List of solutions to use for the linearization point, when linpsolnum is set to from_list.
linpmanualsolnum	solution number		Solution number (index) to use for the linearization point, when linpsolnum is set to manual.
linpmethod	init \| sol	init	Method used for linearization point, which for sol is determined by the current solution (that is, the solution computed by the previous feature in the sequence).
linpsol	zero \| solution object	zero	Linearization point solution.
linpsolnum	all \| auto \| first \| last \| from_list \| interp \| manual \| solution number	current	Linearization point solution to use.
linpt	double		Interpolated point for the linearization point when linpsolnum is set to interp.
maxnreigs	Integer	200	Maximum number of eigenvalues.
neigs	Integer	6	Desired number of eigenvalues.
neigsactive	on \| off	off	Set desired number of eigenvalues.
shift	Complex scalar	0	Shift.
shiftactive	on \| off	off	Use shift.

Table 6-118: Properties for Study Settings.

Approximate number of eigenvalues.

chkeigregion

on | off

Perform consistency check.

eigli

Real scalar

Largest imaginary part.

manual | region | all

manual

Eigenvalue search method; the all method finds all eigenvalues for a full matrix and can only be used for small eigenvalue problems.

eigsi

Real scalar

Smallest imaginary part.

lm | lr | sr | li | si

Eigenfrequency search method around shift.

linplistsolnum

integer array

List of solutions to use for the linearization point, when linpsolnum is set to from_list.

linpmanualsolnum

solution number

Solution number (index) to use for the linearization point, when linpsolnum is set to manual.

linpmethod

init | sol

init

Method used for linearization point, which for sol is determined by the current solution (that is, the solution computed by the previous feature in the sequence).

linpsol

zero | solution object

zero

Linearization point solution.

linpsolnum

current

Linearization point solution to use.

linpt

double

Interpolated point for the linearization point when linpsolnum is set to interp.

maxnreigs

Integer

200

Maximum number of eigenvalues.

neigs

Integer

Desired number of eigenvalues.

neigsactive

on | off

off

Set desired number of eigenvalues.

on | off

Table 6-119: Properties for Physics and Variables Selection.
Property	Value	Default	Description
activate	String Map		See Physics and Variables Selection.
activateCoupling	String Map		See Physics and Variables Selection.
activaterom	String Map		See Physics and Variables Selection.
disabledcommon	Reference Array		See Physics and Variables Selection.
disabledcoordinatesystems	Reference Array		See Physics and Variables Selection.
disabledcoupling	Reference Array		See Physics and Variables Selection.
disabledpair	Reference Array		See Physics and Variables Selection.
disabledphysics	Reference Array		See Physics and Variables Selection.
disabledreduced	Reference Array		See Physics and Variables Selection.
disabledvariables	Reference Array		See Physics and Variables Selection.
disableFrameControl	Reference Array		See Physics and Variables Selection.
discretization	String Map		See Physics and Variables Selection.
equationform	String Map		See Physics and Variables Selection.
equationform_freq	String Map		See Physics and Variables Selection.
equationform_freq_src	String Map		See Physics and Variables Selection.
reconstructors	String Map		See Physics and Variables Selection.
useadvanceddisable	on \| off	off	See Physics and Variables Selection.

Table 6-119: Properties for Physics and Variables Selection.

See Physics and Variables Selection.

activateCoupling

String Map

See Physics and Variables Selection.

activaterom

String Map

See Physics and Variables Selection.

disabledcommon

Reference Array

See Physics and Variables Selection.

disabledcoordinatesystems

Reference Array

See Physics and Variables Selection.

disabledcoupling

Reference Array

See Physics and Variables Selection.

disabledpair

Reference Array

See Physics and Variables Selection.

disabledphysics

Reference Array

See Physics and Variables Selection.

disabledreduced

Reference Array

See Physics and Variables Selection.

disabledvariables

Reference Array

See Physics and Variables Selection.

disableFrameControl

Reference Array

See Physics and Variables Selection.

discretization

String Map

See Physics and Variables Selection.

equationform

String Map

See Physics and Variables Selection.

equationform_freq

String Map

See Physics and Variables Selection.

equationform_freq_src

String Map

See Physics and Variables Selection.

reconstructors

String Map

See Physics and Variables Selection.

useadvanceddisable

on | off

off

See Physics and Variables Selection.

Table 6-120: Properties for Values of Dependent Variables.
Property	Value	Default	Description
notlistsolnum	Vector of integers	[1]	Indices to selected solutions for values for variables not solved for.
notmanualsolnum	Vector of integers	[1]	Indices to solutions for values for variables not solved for.
notsolmethod	init \| sol	init	Method for values for variables not solved for.
notsolnum	auto \| all \| first \| last \| from_list \| interp \| manual \| positive integer	auto	Solution selection for values for variables not solved for.
notstudy	String		Reference to study or "zero" for zero solution.
nott	String		Specify time for interpolated solution of values for variables not solved for.
outputInterface	The interfaces to use as key		An output property for the physics interfaces in the output. It can be used as keys while setting the outputmap and outputselectionmap.
outputmap	String Map		See Store in Output for possible options and defaults (this property corresponds to the Output column). Possible values are physics, all, none, or selection.
outputselectionmap	String Map		A semicolon-separated string array of the output selections (specified with tags).

Table 6-120: Properties for Values of Dependent Variables.

Indices to selected solutions for values for variables not solved for.

notmanualsolnum

Vector of integers

[1]

Indices to solutions for values for variables not solved for.

notsolmethod

init | sol

init

Method for values for variables not solved for.

notsolnum

auto

Solution selection for values for variables not solved for.

notstudy

String

Reference to study or "zero" for zero solution.

nott

String

Specify time for interpolated solution of values for variables not solved for.

outputInterface

The interfaces to use as key

An output property for the physics interfaces in the output. It can be used as keys while setting the outputmap and outputselectionmap.

outputmap

String Map

See Store in Output for possible options and defaults (this property corresponds to the column). Possible values are physics, all, none, or selection.

outputselectionmap

String Map

A semicolon-separated string array of the output selections (specified with tags).

See setEntry() for information about setting the values for a property that uses a String Map. If you use the set(pname,value) method, you have to provide all alternating property name and property value pairs.

Table 6-121: Property for Mesh selection.
Property	Value	Default	Description
mesh	Vector of strings		Select meshes for geometries. The length of the vector is two times the number of geometries. Example value when two geometries geom1 and geom2 are available is: new String[]{"geom1","mesh1","geom2", "mesh2"}.

Table 6-121: Property for Mesh selection.

Select meshes for geometries. The length of the vector is two times the number of geometries. Example value when two geometries geom1 and geom2 are available is: new String[]{"geom1","mesh1","geom2", "mesh2"}.