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)
Logically Collective
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 Parameter#
- 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#
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