# 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


## 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
```none
val = (x,y) = y^T x,
```
where y^T denotes the transpose of y.

Use VecDot() for the inner product
```none
val = (x,y) = y^H x,
```
where y^H denotes the conjugate transpose of y.


## See Also
 [](chapter_vectors), `Vec`, `VecDot()`, `VecMTDot()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/interface/rvector.c.html#VecTDot">src/vec/vec/interface/rvector.c</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/impls/mpi/kokkos/mpikok.kokkos.cxx.html#VecTDot_MPIKokkos">VecTDot_MPIKokkos in src/vec/vec/impls/mpi/kokkos/mpikok.kokkos.cxx</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/impls/mpi/mpicuda/mpicuda.cu.html#VecTDot_MPICUDA">VecTDot_MPICUDA in src/vec/vec/impls/mpi/mpicuda/mpicuda.cu</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/impls/mpi/mpihip/mpihip.hip.c.html#VecTDot_MPIHIP">VecTDot_MPIHIP in src/vec/vec/impls/mpi/mpihip/mpihip.hip.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/impls/mpi/mpiviennacl/mpiviennacl.cxx.html#VecTDot_MPIViennaCL">VecTDot_MPIViennaCL in src/vec/vec/impls/mpi/mpiviennacl/mpiviennacl.cxx</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/impls/mpi/pbvec.c.html#VecTDot_MPI">VecTDot_MPI in src/vec/vec/impls/mpi/pbvec.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/impls/nest/vecnest.c.html#VecTDot_Nest">VecTDot_Nest in src/vec/vec/impls/nest/vecnest.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/impls/seq/bvec1.c.html#VecTDot_Seq">VecTDot_Seq in src/vec/vec/impls/seq/bvec1.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/impls/seq/kokkos/veckok.kokkos.cxx.html#VecTDot_SeqKokkos">VecTDot_SeqKokkos in src/vec/vec/impls/seq/kokkos/veckok.kokkos.cxx</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/impls/seq/seqcuda/veccuda2.cu.html#VecTDot_SeqCUDA">VecTDot_SeqCUDA in src/vec/vec/impls/seq/seqcuda/veccuda2.cu</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/impls/seq/seqhip/vechip2.hip.c.html#VecTDot_SeqHIP">VecTDot_SeqHIP in src/vec/vec/impls/seq/seqhip/vechip2.hip.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/impls/seq/seqviennacl/vecviennacl.cxx.html#VecTDot_SeqViennaCL">VecTDot_SeqViennaCL in src/vec/vec/impls/seq/seqviennacl/vecviennacl.cxx</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/vec/interface/rvector.c)


[Index of all Vec routines](index.md)  
[Table of Contents for all manual pages](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
