# ISCreateGeneralWithArray

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

### Synopsis

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

Collective on MPI_Comm

### Input Parameters

| comm | - the MPI communicator
| n | - the length of the index set
| idx | - the list of integers

### Output Parameter

is -the new index set

### Notes

Unlike with ISCreateGeneral, the indices are not copied to internally allocated storage. The user array is not freed by ISDestroy.

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

ISCreateGeneral(), ISCreateStride(), ISCreateBlock(), ISAllGather()

Level:beginner
Location:src/vec/is/impls/general/general.c
Index of all IS routines
Table of Contents for all manual pages
Index of all manual pages