# 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

## 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

## Notes#

The index set cannot be of type stride or block

Any integers in is 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.

Application Orderings, AO, AOCreateBasic(), AOView(), AOPetscToApplication(), AOPetscToApplicationIS(), AOApplicationToPetsc()

beginner

## Location#

src/vec/is/ao/interface/ao.c

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