*EIGEN

*EIGEN, Kmatrix, Mmatrix, Cmatrix, Evals, Evects
Performs a modal solution with unsymmetric or damping matrices.

APDL: Matrix Operations

Argument Descriptions

Kmatrix: Name of the stiffness matrix. May be a real or complex-valued matrix.
Mmatrix: Name of the mass matrix.
Cmatrix: Name of the damping matrix (used only for MODOPT,DAMP).
Evals: Name of the output eigenvalues vector. It will be an m-long *VEC vector of complex values, where m is the number of eigenvalues requested (MODOPT).
Evects: Name of the output eigenvector matrix. It will be a n x m *DMAT (dense) matrix of complex values, where n is the size of the matrix and m is the number of eigenvalues requested (MODOPT).

Notes

Use the command ANTYPE,MODAL and the MODOPT command to specify the modal solution options. Only MODOPT,DAMP, MODOPT,UNSYM, MODOPT,LANB, and MODOPT,SUBSP are supported.

*EIGEN with Block Lanczos (LANB) only supports sparse matrices.

Distributed-Memory Parallel (DMP) Restriction — This command is not supported in a DMP solution.

Menu Paths

This command cannot be accessed from a menu.