petsc3.11.4 20190928
VecGetSubVector
Gets a vector representing part of another vector
Synopsis
#include "petscvec.h"
PetscErrorCode VecGetSubVector(Vec X,IS is,Vec *Y)
Collective on IS (and Vec if nonlocal entries are needed)
Input Arguments
 X   vector from which to extract a subvector

 is   index set representing portion of X to extract

Output Arguments
Y subvector corresponding to is
Notes
The subvector Y should be returned with VecRestoreSubVector().
This function may return a subvector without making a copy, therefore it is not safe to use the original vector while
modifying the subvector. Other nonoverlapping subvectors can still be obtained from X using this function.
See Also
MatCreateSubMatrix()
Level
advanced
Location
src/vec/vec/interface/rvector.c
Examples
src/snes/examples/tutorials/ex70.c.html
Implementations
VecGetSubVector_Nest in src/vec/vec/impls/nest/vecnest.c
Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages