petsc-dev 2014-04-16
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ISDifference

Computes the difference between two index sets.

Synopsis

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

Input Parameter

is1 - first index, to have items removed from it
is2 - index values to be removed

Output Parameters

isout -is1 - is2

Notes

Negative values are removed from the lists. is2 may have values that are not in is1. This requires O(imax-imin) memory and O(imax-imin) work, where imin and imax are the bounds on the indices in is1.

See Also

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