SystemMatrix

Create a numerical evaluation of system matrix.

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();

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. You can also use this methods to retrieve matrices and vectors directly from reduced model datasets.

The following properties are available:

Table 7-128: 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	allloads \| damping \| dampingratio \| ddinctrl \| dinctrl \| dinctrl0 \| dpartsol \| epartsol \| inctrl \| inctrl0 \| inoutput \| kud \| load \| mass \| projection \| stiffness \| output \| outputbias \| u0 \| udot0 \| ul	stiffness	The matrix to retrieve if the solver feature is a frequency-dependent Modal Solver feature.
matrixmodalstate	allloads \| damping \| dampingratio \| ddinctrl \| dinctrl \| dinctrl0 \| dpartsol \| epartsol \| inctrl \| inctrl0 \| inoutput \| kud \| load \| mass \| projection \| ssc \| ssd \| ssma \| ssmb \| ssmc \| ssnull \| ssud \| ssx0 \| stiffness \| output \| outputbias \| u0 \| udot0 \| ul	stiffness	The matrix to retrieve if the solver feature is a time-dependent Modal Solver feature.
matrixstatespace	ssc \| ssd \| ssma \| ssmb \| ssmc \| ssnull \| ssud \| ssx0	ssma	The matrix to retrieve if the solver feature is a State Space feature.
reducedmodelmatrix	allloads \| damping \| dampingratio \| ddinctrl \| dinctrl \| dinctrl0 \| dpartsol \| epartsol \| inctrl \| inctrl0 \| inoutput \| kud \| load \| mass \| projection \| ssc \| ssd \| ssma \| ssmb \| ssmc \| ssnull \| ssud \| ssx0 \| stiffness \| output \| outputbias \| u0 \| udot0 \| ul	stiffness	The matrix to retrieve if the solution is from a Reduced Model dataset.
solution	String	First compatible solution	The solution this dataset refers to.