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 7-95: 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 || 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.