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 Parameters#

  • 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

Examples#

src/ksp/ksp/tutorials/ex81.c.html


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Index of all IS routines
Table of Contents for all manual pages
Index of all manual pages