BVDotColumn#

Computes multiple dot products of a column against all the previous columns of a BV.

Synopsis#

#include "slepcbv.h" 
PetscErrorCode BVDotColumn(BV X,PetscInt j,PetscScalar q[])

Collective

Input Parameters#

  • X - basis vectors

  • j - the column index

Output Parameter#

  • q - an array where the result must be placed

Notes#

This operation is equivalent to BVDotVec() but it uses column j of X rather than taking a Vec as an argument. The number of active columns of X is set to j before the computation, and restored afterwards. If X has leading columns specified, then these columns do not participate in the computation. Therefore, the length of array q must be at least j minus the number of leading columns.

Developer Notes#

If q is NULL, then the result is written in position nc+l of the internal buffer vector, see BVGetBufferVec().

See Also#

BV: Basis Vectors, BVDot(), BVDotVec(), BVSetActiveColumns(), BVSetMatrix()

Level#

intermediate

Location#

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

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