#include "slepceps.h" PetscErrorCode EPSGetInvariantSubspace(EPS eps,Vec v)Collective
|eps||- the eigensolver context|
|v||- an array of vectors|
The user should provide in v an array of nconv vectors, where nconv is the value returned by EPSGetConverged().
The first k vectors returned in v span an invariant subspace associated with the first k computed eigenvalues (note that this is not true if the k-th eigenvalue is complex and matrix A is real; in this case the first k+1 vectors should be used). An invariant subspace X of A satisfies Ax in X for all x in X (a similar definition applies for generalized eigenproblems).