VecDotRealPart#

Computes the real part of the vector dot product.

Synopsis#

#include "petscvec.h"   
PetscErrorCode VecDotRealPart(Vec x, Vec y, PetscReal *val)

Collective

Input Parameters#

  • x - first vector

  • y - second vector

Output Parameter#

  • val - the real part of the dot product;

Performance Issues#

    per-processor memory bandwidth
    interprocessor latency
    work load imbalance that causes certain processes to arrive much earlier than others

Notes for Users of Complex Numbers#

See VecDot() for more details on the definition of the dot product for complex numbers

For real numbers this returns the same value as VecDot()

For complex numbers in C^n (that is a vector of n components with a complex number for each component) this is equal to the usual real dot product on the the space R^{2n} (that is a vector of 2n components with the real or imaginary part of the complex numbers for components)

Developer Note#

This is not currently optimized to compute only the real part of the dot product.

See Also#

Vectors and Parallel Data, Vec, VecMDot(), VecTDot(), VecNorm(), VecDotBegin(), VecDotEnd(), VecDot(), VecDotNorm2()

Level#

intermediate

Location#

src/vec/vec/interface/rvector.c

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Index of all Vec routines
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Index of all manual pages