petsc3.9.4 20180911
VecISAXPY
Adds a reduced vector to the appropriate elements of a fullspace 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 fullspace vector

 is   the index set for the reduced space

 alpha   the scalar coefficient

 vreduced   the reducedspace vector

Output Parameters
vfull the sum of the fullspace vector and reducedspace vector
See Also
VecAXPY()
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