ISCreate#

Creates an index set object. IS are objects used to do efficient indexing into other data structures such as Vec and Mat

Synopsis#

#include "petscis.h"  
PetscErrorCode ISCreate(MPI_Comm comm, IS *is)

Collective

Input Parameter#

  • comm - the MPI communicator

Output Parameter#

  • is - the new index set

Notes#

When the communicator is not MPI_COMM_SELF, the operations on is are NOT conceptually the same as MPI_Group operations. The IS are then distributed sets of indices and thus certain operations on them are collective.

See Also#

Low-level Vector Communication, IS, ISType(), ISSetType(), ISCreateGeneral(), ISCreateStride(), ISCreateBlock(), ISAllGather()

Level#

beginner

Location#

src/vec/is/is/interface/isreg.c

Examples#

src/ksp/ksp/tutorials/ex87.c
src/ksp/ksp/tutorials/ex76.c
src/ksp/ksp/tutorials/ex27.c

Implementations#

ISCreate_Block() in src/vec/is/is/impls/block/block.c
ISCreate_General() in src/vec/is/is/impls/general/general.c
ISCreate_Stride() in src/vec/is/is/impls/stride/stride.c


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