petsc-dev 2014-08-19
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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