petsc-main 2021-04-20
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# VecTDot

Computes an indefinite vector dot product. That is, this routine does NOT use the complex conjugate.

### Synopsis

```#include "petscvec.h"
PetscErrorCode  VecTDot(Vec x,Vec y,PetscScalar *val)
```
Collective on Vec

### Input Parameters

 x, y - the vectors

### Output Parameter

 val - the dot product

### Notes for Users of Complex Numbers

For complex vectors, VecTDot() computes the indefinite form
```    val = (x,y) = y^T x,
```
where y^T denotes the transpose of y.

Use VecDot() for the inner product

```    val = (x,y) = y^H x,
```
where y^H denotes the conjugate transpose of y.

VecDot(), VecMTDot()

intermediate

### Location

src/vec/vec/interface/rvector.c

### Implementations

VecTDot_MPIKokkos in src/vec/vec/impls/mpi/kokkos/mpikok.kokkos.cxx
VecTDot_MPICUDA in src/vec/vec/impls/mpi/mpicuda/mpicuda.cu
VecTDot_MPIViennaCL in src/vec/vec/impls/mpi/mpiviennacl/mpiviennacl.cxx
VecTDot_MPI in src/vec/vec/impls/mpi/pbvec.c
VecTDot_Nest in src/vec/vec/impls/nest/vecnest.c
VecTDot_Seq in src/vec/vec/impls/seq/bvec1.c
VecTDot_SeqKokkos in src/vec/vec/impls/seq/kokkos/veckok.kokkos.cxx
VecTDot_SeqCUDA in src/vec/vec/impls/seq/seqcuda/veccuda2.cu
VecTDot_SeqViennaCL in src/vec/vec/impls/seq/seqviennacl/vecviennacl.cxx

Index of all Vec routines