eigen(solver='-genBandArpack', numEigenvalues)
Eigen value analysis. Return a list of eigen values.
| numEigenvalues | number of eigenvalues required |
| solver | 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