# VecDotBegin

Starts a split phase dot product computation.

### Synopsis

    #include "petscvec.h"
    int VecDotBegin(Vec x,Vec y,PetscScalar *result)

### Input Parameters

| x | - the first vector
| y | - the second vector
| result | - where the result will go (can be PETSC_NULL)

### Notes

Each call to VecDotBegin() should be paired with a call to VecDotEnd().

seealso: VecDotEnd(), VecNormBegin(), VecNormEnd(), VecNorm(), VecDot(), VecMDot(), VecTDotBegin(), VecTDotEnd()

Level:advanced
Location: src/vec/utils/comb.c
Index of all Vec routines
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Index of all manual pages