slepc-3.6.3 2016-03-29
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# SVDSetInitialSpaceLeft

Specify a basis of vectors that constitute the initial left space, that is, a rough approximation to the left singular subspace from which the solver starts to iterate.

### Synopsis

    #include "slepcsvd.h"
    PetscErrorCode SVDSetInitialSpaceLeft(SVD svd,PetscInt n,Vec *is)

Collective on SVD and Vec

### Input Parameter

| svd | - the singular value solver context
| n | - number of vectors
| is | - set of basis vectors of the initial space

### Notes

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.

### See Also

SVDSetInitialSpace()

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