petsc-3.8.4 2018-03-24

VecISAXPY

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

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

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

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