petsc-3.9.0 2018-04-07
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ISExpand

Computes the union of two index sets, by concatenating 2 lists and removing duplicates.

Synopsis

#include "petscis.h"  
PetscErrorCode ISExpand(IS is1,IS is2,IS *isout)
Collective on IS

Input Parameter

is1 - first index set
is2 - index values to be added

Output Parameters

isout -is1 + is2 The index set is2 is appended to is1 removing duplicates

Notes

Negative values are removed from the lists. This requires O(imax-imin) memory and O(imax-imin) work, where imin and imax are the bounds on the indices in is1 and is2.

The IS's do not need to be sorted.

See Also

ISDestroy(), ISView(), ISDifference(), ISSum()

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