5.8. eigen commandΒΆ
-
eigen
(solver='-genBandArpack', numEigenvalues) Eigen value analysis. Return a list of eigen values.
numEigenvalues (int) number of eigenvalues required solver (str) optional string detailing type of solver: '-genBandArpack'
,'-fullGenLapack'
, (optional)
Note
- 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.
- The -fullGenLapack option is VERY SLOW for moderate to large models