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 equal to 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#
BVDot(), BVDotVec(), BVSetActiveColumns(), BVSetMatrix()
Level#
advanced
Location#
src/sys/classes/bv/interface/bvglobal.c
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