VecWAXPY#

Computes w = alpha x + y.

Synopsis#

#include "petscvec.h"   
PetscErrorCode VecWAXPY(Vec w, PetscScalar alpha, Vec x, Vec y)

Logically Collective

Input Parameters#

  • alpha - the scalar

  • x - first vector, multiplied by alpha

  • y - second vector

Output Parameter#

  • w - the result

Note#

w cannot be either x or y, but x and y can be the same

Developer Notes#

The implementation is optimized for alpha of -1.0, 0.0, and 1.0

See Also#

Vectors and Parallel Data, Vec, VecAXPY(), VecAYPX(), VecAXPBY(), VecMAXPY(), VecAXPBYPCZ()

Level#

intermediate

Location#

src/vec/vec/interface/rvector.c

Examples#

src/tao/tutorials/ex4.c
src/tao/constrained/tutorials/tomographyADMM.c
src/ts/tutorials/ex10.c
src/vec/vec/tutorials/ex1.c
src/tao/pde_constrained/tutorials/hyperbolic.c
src/tao/unconstrained/tutorials/burgers_spectral.c
src/tao/unconstrained/tutorials/spectraladjointassimilation.c
src/tao/pde_constrained/tutorials/parabolic.c
src/tao/pde_constrained/tutorials/elliptic.c

Implementations#

VecWAXPY_Nest() in src/vec/vec/impls/nest/vecnest.c
VecWAXPY_Seq() in src/vec/vec/impls/seq/dvec2.c
VecWAXPY_SeqKokkos() in src/vec/vec/impls/seq/kokkos/veckok.kokkos.cxx
VecWAXPY_SeqViennaCL() in src/vec/vec/impls/seq/seqviennacl/vecviennacl.cxx


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Index of all manual pages