SystemMatrix

Create a numerical evaluation of system matrix.

Syntax

model.result().numerical().create(<ftag>,"SystemMatrix");

model.result().numerical(<ftag>).set(property, <value>);

model.result().numerical(<ftag>).getData();

model.result().numerical(<ftag>).getData(<expressionIndex>);

model.result().numerical(<ftag>).getImagData();

model.result().numerical(<ftag>).getImagData(<expressionIndex>);

model.result().numerical(<ftag>).isComplex();

model.result().numerical(<ftag>).isComplex(<outersolnum>);

model.result().numerical(<ftag>).getNData();

model.result().numerical(<ftag>).run();

Description

model.result().numerical().create(<ftag>,"SystemMatrix") create a system matrix evaluation feature with the name <ftag>.

The system matrix evaluation makes it possible to retrieve matrices directly from Assemble and Modal features in a solver sequence.

The following properties are available:

Table 7-90: Valid Property/Value Pairs for System Matrix Evaluations.

Property	Value	Default	Description
feature	String	The first Assemble or Modal feature in the chosen solution.	The solver feature from which the matrix is retrieved.
matrixassem	constraint | constraintforcejac | constraintforcenullbasis | constraintjac | constraintnullbasis | damping | elimdamping | elimload | elimmass | elimstiffness | load | lowerboundconstraint | mass | optconstraint | optconstraintjac | partsol | stiffness | upperboundconstraint | uscale	stiffness	The matrix to retrieve if the solver feature is an Assemble feature. See also the documentation for Assemble in the COMSOL Multiphysics Reference Manual.
matrixmodal	damping | dampingratio | load | loaddev | loadzero | mass | projection | stiffness	stiffness	The matrix to retrieve if the solver feature is a Modal Solver feature. See also the documentation for Modal Solver in the COMSOL Multiphysics Reference Manual.
solution	String	First compatible solution	The solution this data set refers to.