PETSc version 3.17.4
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# AOApplicationToPetscIS

Maps an index set in the application-defined ordering to the PETSc ordering.

### Synopsis

    #include "petscao.h"
    PetscErrorCode  AOApplicationToPetscIS(AO ao,IS is)

Collective on AO

### Input Parameters

| ao | - the application ordering context
| is | - the index set; this is replaced with its mapped values

### Output Parameter

| is | - the mapped index set

### Note

The index set cannot be of type stride or block

Any integers in ia[] that are negative are left unchanged. This allows one to convert, for example, neighbor lists that use negative entries to indicate nonexistent neighbors due to boundary conditions, etc.

### See Also

AOCreateBasic(), AOView(), AOPetscToApplication(),
AOPetscToApplicationIS(), AOApplicationToPetsc()

### Level

beginner

### Location

src/vec/is/ao/interface/ao.c
Index of all AO routines
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Index of all manual pages