#include "slepcpep.h" PetscErrorCode PEPSetInitialSpace(PEP pep,PetscInt n,Vec is)Collective
|pep||- the polynomial eigensolver context|
|n||- number of vectors|
|is||- set of basis vectors of the initial space|
These vectors do not persist from one PEPSolve() call to the other, so the initial space should be set every time.
The vectors do not need to be mutually orthonormal, since they are explicitly orthonormalized internally.
Common usage of this function is when the user can provide a rough approximation of the wanted eigenspace. Then, convergence may be faster.