ISCreateGeneral

Creates a data structure for an index set containing a list of integers.

Synopsis

#include "petscis.h"  
PetscErrorCode ISCreateGeneral(MPI_Comm comm, PetscInt n, const PetscInt idx[], PetscCopyMode mode, IS *is)

Collective

Input Parameters

• comm - the MPI communicator

• n - the length of the index set

• idx - the list of integers

• mode - PETSC_COPY_VALUES, PETSC_OWN_POINTER, or PETSC_USE_POINTER; see PetscCopyMode for meaning of this flag.

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.

Use ISGeneralSetIndices() to provide indices to an already existing IS of ISType ISGENERAL

See Also

Low-level Vector Communication, IS, ISGENERAL, ISCreateStride(), ISCreateBlock(), ISAllGather(), PETSC_COPY_VALUES, PETSC_OWN_POINTER, PETSC_USE_POINTER, PetscCopyMode, ISGeneralSetIndicesFromMask()

Level

beginner

Location

src/vec/is/is/impls/general/general.c

Examples

src/ksp/ksp/tutorials/ex84.c
src/ksp/ksp/tutorials/ex85.c
src/dm/tutorials/swarm_ex3.c
src/vec/is/is/tutorials/ex1.c
src/dm/tutorials/ex6.c
src/ksp/ksp/tutorials/ex49.c
src/ksp/ksp/tutorials/ex59.c
src/dm/field/tutorials/ex1.c
src/ksp/ksp/tutorials/ex71.c
src/dm/tutorials/ex22.c

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