slepc-3.13.0 2020-03-31
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Specify two basis of vectors that constitute the initial right and/or left spaces, that is, a rough approximation to the right and/or left singular subspaces from which the solver starts to iterate.


#include "slepcsvd.h" 
PetscErrorCode SVDSetInitialSpaces(SVD svd,PetscInt nr,Vec isr[],PetscInt nl,Vec isl[])
Collective on svd

Input Parameter

svd  - the singular value solver context
nr  - number of right vectors
isr  - set of basis vectors of the right initial space
nl  - number of left vectors
isl  - set of basis vectors of the left initial space


It is not necessary to provide both sets of vectors.

Some solvers start to iterate on a single vector (initial vector). In that case, the other vectors are ignored.

These vectors do not persist from one SVDSolve() 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 singular space. Then, convergence may be faster.

Location: src/svd/interface/svdsetup.c
Index of all SVD routines
Table of Contents for all manual pages
Index of all manual pages