Eigen Command: Difference between revisions
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| style="width:150px" | '''$numEigenvalues''' || number of eigenvalues required | | style="width:150px" | '''$numEigenvalues''' || number of eigenvalues required | ||
|- | |- | ||
| '''$solver'''|| optional string detailing type of solver: -genBandArpack, | | '''$solver'''|| optional string detailing type of solver: -genBandArpack, -symmBandLapack, -fullGenLapack (default: -genBandArpack) | ||
|} | |} | ||
Revision as of 03:28, 13 December 2013
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This command is used to perform the analysis.
| eigen <$solver> $numEigenvalues |
| $numEigenvalues | number of eigenvalues required |
| $solver | optional string detailing type of solver: -genBandArpack, -symmBandLapack, -fullGenLapack (default: -genBandArpack) |
RETURNS:
a tcl string containg eigenvalues.
NOTES:
- The eigenvectors are stored at the nodes and can be printed out using a Node Recorder, the nodeEigenvector command, or the Print command.
- The default eigensolver is able to solve only for N-1 eigenvalues, where N is the number of inertial DOFs. When running into this limitation the -fullGenLapack solver can be used instead of the default Arpack solver.
THEORY:
- <math> \left (K - \lambda M \right ) \Phi = 0 </math>
EXAMPLE:
set eigenvalues [eigen 10];
Code Developed by: fmk