slepc-main 2024-11-15
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
Index of all BV routines
Table of Contents for all manual pages
Index of all manual pages