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', '-symmBandLapack', '-fullGenLapack', (optional)


  1. The eigenvectors are stored at the nodes and can be printed out using a Node Recorder, the nodeEigenvector command, or the Print command.
  2. 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.