PETSc version 3.15.5
VecISCopy
Copies between a reduced vector and the appropriate elements of a full-space vector. 
Synopsis
#include "petscvec.h"  
PetscErrorCode VecISCopy(Vec vfull, IS is, ScatterMode mode, Vec vreduced)
Input Parameters
|  | vfull | - the full-space vector | 
|  | is | - the index set for the reduced space | 
|  | mode | - the direction of copying, SCATTER_FORWARD or SCATTER_REVERSE | 
|  | 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.
mode == SCATTER_FORWARD: vfull[is[i]] = vreduced[i]
mode == SCATTER_REVERSE: vreduced[i] = vfull[is[i]]
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