BVGetBufferVec#

Obtain the buffer vector associated with the BV object.

Synopsis#

#include "slepcbv.h" 
PetscErrorCode BVGetBufferVec(BV bv,Vec *buffer)

Collective

Input Parameters#

  • bv - the basis vectors context

Output Parameter#

  • buffer - vector

Notes#

The vector is created if not available previously. It is a sequential vector of length (nc+m)*m, where m is the number of columns of bv and nc is the number of constraints.

Developer Notes#

The buffer vector is viewed as a column-major matrix with leading dimension ld=nc+m, and m columns at most. In the most common usage, it has the structure

      | | C |
      |s|---|
      | | H |

where H is an upper Hessenberg matrix of order m x (m-1), C contains coefficients related to orthogonalization against constraints (first nc rows), and s is the first column that contains scratch values computed during Gram-Schmidt orthogonalization. In particular, BVDotColumn() and BVMultColumn() use s to store the coefficients.

See Also#

BVSetBufferVec(), BVSetSizes(), BVGetNumConstraints(), BVDotColumn(), BVMultColumn()

Level#

developer

Location#

src/sys/classes/bv/interface/bvbasic.c

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