VecDot#
Computes the vector dot product.
Synopsis#
#include "petscvec.h"
PetscErrorCode VecDot(Vec x, Vec y, PetscScalar *val)
Collective
Input Parameters#
x - first vector
y - second vector
Output Parameter#
val - the dot product
Notes for Users of Complex Numbers#
For complex vectors, VecDot() computes
val = (x,y) = y^H x,
where y^H denotes the conjugate transpose of y. Note that this corresponds to the usual “mathematicians” complex
inner product where the SECOND argument gets the complex conjugate. Since the BLASdot() complex conjugates the first
first argument we call the BLASdot() with the arguments reversed.
Use VecTDot() for the indefinite form
val = (x,y) = y^T x,
where y^T denotes the transpose of y.
See Also#
Vectors and Parallel Data, Vec, VecMDot(), VecTDot(), VecNorm(), VecDotBegin(), VecDotEnd(), VecDotRealPart()
Level#
intermediate
Location#
Examples#
src/vec/vec/tutorials/ex20f90.F90
src/vec/vec/tutorials/ex1f.F90
src/vec/vec/tutorials/ex1.c
src/vec/vec/tutorials/ex1f90.F90
src/vec/vec/tutorials/performance.c
src/tao/pde_constrained/tutorials/hyperbolic.c
src/ksp/ksp/tutorials/ex49.c
src/tao/pde_constrained/tutorials/elliptic.c
src/vec/vec/tutorials/ex18.c
src/vec/vec/tutorials/ex18f.F90
Implementations#
VecDot_MPIKokkos() in src/vec/vec/impls/mpi/kokkos/mpikok.kokkos.cxx
VecDot_MPIViennaCL() in src/vec/vec/impls/mpi/mpiviennacl/mpiviennacl.cxx
VecDot_MPI() in src/vec/vec/impls/mpi/pvec2.c
VecDot_Nest() in src/vec/vec/impls/nest/vecnest.c
VecDot_Seq() in src/vec/vec/impls/seq/bvec1.c
VecDot_SeqKokkos() in src/vec/vec/impls/seq/kokkos/veckok.kokkos.cxx
VecDot_SeqViennaCL() in src/vec/vec/impls/seq/seqviennacl/vecviennacl.cxx
Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages