PETSc version 3.17.4
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# ISCreate

Creates an index set object.

### Synopsis

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

Collective

### Input Parameters

| 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

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

### Level

beginner

### Location

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

### Examples

src/ksp/ksp/tutorials/ex76.c.html
src/ksp/ksp/tutorials/ex76f.F90.html

### 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
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Index of all manual pages