BVMultVec#

Computes \(y = \beta y + \alpha X q\).

Synopsis#

#include "slepcbv.h" 
PetscErrorCode BVMultVec(BV X,PetscScalar alpha,PetscScalar beta,Vec y,PetscScalar q[])

Logically Collective

Input Parameters#

  • X - a basis vectors object

  • alpha - first scalar

  • beta - second scalar

  • y - a vector (modified on output)

  • q - an array of scalars

Notes#

This operation is the analogue of BVMult() but with a BV and a Vec, instead of two BVs. Note that arguments are listed in different order with respect to BVMult().

If X has leading columns specified, then these columns do not participate in the computation.

The length of array q must be equal to the number of active columns of X minus the number of leading columns, i.e., the first entry of q multiplies the first non-leading column.

See Also#

BV: Basis Vectors, BVMult(), BVMultColumn(), BVMultInPlace(), BVSetActiveColumns()

Level#

intermediate

Location#

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

Implementations#

BVMultVec_Contiguous() in src/sys/classes/bv/impls/contiguous/contig.c
BVMultVec_Mat() in src/sys/classes/bv/impls/mat/bvmat.c
BVMultVec_Svec() in src/sys/classes/bv/impls/svec/svec.c
BVMultVec_Vecs() in src/sys/classes/bv/impls/vecs/vecs.c

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