BVGetArrayRead#

Returns a read-only pointer to a contiguous array that contains this processor’s portion of the BV data.

Synopsis#

#include "slepcbv.h" 
PetscErrorCode BVGetArrayRead(BV bv,const PetscScalar **a)

Not Collective

Input Parameters#

  • bv - the basis vectors context

Output Parameter#

  • a - location to put pointer to the array

Notes#

BVRestoreArrayRead() must be called when access to the array is no longer needed. This operation may imply a data copy, for BV types that do not store data contiguously in memory.

The pointer will normally point to the first entry of the first column, but if the BV has constraints then these go before the regular columns.

See Also#

BVRestoreArray(), BVInsertConstraints(), BVGetLeadingDimension(), BVGetArray()

Level#

advanced

Location#

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

Implementations#

BVGetArrayRead_Contiguous() in src/sys/classes/bv/impls/contiguous/contig.c
BVGetArrayRead_Mat() in src/sys/classes/bv/impls/mat/bvmat.c
BVGetArrayRead_Svec() in src/sys/classes/bv/impls/svec/svec.c
BVGetArrayRead_Vecs() in src/sys/classes/bv/impls/vecs/vecs.c

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