slepc-3.16.1 2021-11-17
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BVSetActiveColumns

Specify the columns that will be involved in operations.

Synopsis

#include "slepcbv.h" 
PetscErrorCode BVSetActiveColumns(BV bv,PetscInt l,PetscInt k)
Logically Collective on bv

Input Parameters

bv  - the basis vectors context
l  - number of leading columns
k  - number of active columns

Notes

In operations such as BVMult() or BVDot(), only the first k columns are considered. This is useful when the BV is filled from left to right, so the last m-k columns do not have relevant information.

Also in operations such as BVMult() or BVDot(), the first l columns are normally not included in the computation. See the manpage of each operation.

In orthogonalization operations, the first l columns are treated differently: they participate in the orthogonalization but the computed coefficients are not stored.

See Also

BVGetActiveColumns(), BVSetSizes()

Location: src/sys/classes/bv/interface/bvbasic.c
Index of all BV routines
Table of Contents for all manual pages
Index of all manual pages