petsc-master 2019-08-19
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VecISAXPY

Adds a reduced vector to the appropriate elements of a full-space vector. vfull[is[i]] += alpha*vreduced[i]

Synopsis

#include "petscvec.h"  
PetscErrorCode VecISAXPY(Vec vfull, IS is, PetscScalar alpha, Vec vreduced)

Input Parameters

vfull - the full-space vector
is - the index set for the reduced space
alpha - the scalar coefficient
vreduced - the reduced-space vector

Output Parameters

vfull -the sum of the full-space vector and reduced-space vector

Notes

The index set identifies entries in the global vector. Negative indices are skipped; indices outside the ownership range of vfull will raise an error.

See Also

VecAXPY(), VecGetOwnershipRange()

Level

advanced

Location

src/vec/vec/utils/projection.c
Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages