EPSGetLeftStartVector

Gets a vector to be used as the starting vector in the left recurrence of a two-sided eigensolver.

Synopsis

#include "slepceps.h" 
PetscErrorCode EPSGetLeftStartVector(EPS eps,PetscInt i,Vec vec)
Collective on EPS and Vec

Input Parameters

eps - the eigensolver context
i - index of the Arnoldi/Lanczos step

Output Parameter

vec - the start vector

Notes

The start vector is computed from another vector: for the first step (i=0), the left initial vector is used (see EPSGetLeftInitialVector()); otherwise a random vector is created. Then this vector is forced to be in the range of OP' and orthonormalized with respect to all W-vectors up to i-1.

The caller must pass a vector already allocated with dimensions conforming to the left initial vector. This vector is overwritten.

See Also

EPSGetLeftInitialVector()

Location: src/eps/interface/solve.c
Index of all EPS routines
Table of Contents for all manual pages
Index of all manual pages