petsc-3.12.5 2020-03-29
ISSum
Computes the sum (union) of two index sets.
Synopsis
#include "petscis.h"
PetscErrorCode ISSum(IS is1,IS is2,IS *is3)
Only sequential version (at the moment)
Input Parameter
| is1 | - index set to be extended
|
| is2 | - index values to be added
|
Output Parameter
is3 -the sum; this can not be is1 or is2
Notes
If n1 and n2 are the sizes of the sets, this takes O(n1+n2) time;
Both index sets need to be sorted on input.
See Also
ISDestroy(), ISView(), ISDifference(), ISExpand()
Level
intermediate
Location
src/vec/is/is/utils/isdiff.c
Index of all IS routines
Table of Contents for all manual pages
Index of all manual pages