petsc-3.13.6 2020-09-29
ISCreateSubIS
Create a sub index set from a global index set selecting some components.
Synopsis
#include "petscis.h"
PetscErrorCode ISCreateSubIS(IS is,IS comps,IS *subis)
Collective on IS
Input Parmeters
| is | - the index set
|
| comps | - which components we will extract from is
|
Output Parameters
subis -the new sub index set
Example usage
We have an index set (is) living on 3 processes with the following values
| 4 9 0 | 2 6 7 | 10 11 1|
and another index set (comps) used to indicate which components of is we want to take,
| 7 5 | 1 2 | 0 4|
The output index set (subis) should look like
| 11 7 | 9 0 | 4 6|
See Also
VecGetSubVector(), MatCreateSubMatrix()
Level
intermediate
Location
src/vec/is/is/interface/index.c
Index of all IS routines
Table of Contents for all manual pages
Index of all manual pages