eigen#
- Mapdl.eigen(kmatrix='', mmatrix='', cmatrix='', evals='', evects='', **kwargs)#
Performs a modal solution with unsymmetric or damping matrices.
APDL Command:
*EIGEN
- Parameters:
- 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 ANSYS Restriction: This command is not supported in Distributed ANSYS.