:orphan:
# TaoALMMGetPrimalIS
Retrieve the index set that identifies optimization and slack variable components of the subsolver's solution vector. 
## Synopsis
```
#include "petsctao.h" 
PetscErrorCode TaoALMMGetPrimalIS(Tao tao, IS *opt_is, IS *slack_is)
```

## Input Parameter

- ***tao -*** the `Tao` context for the `TAOALMM` solver



## Output Parameters

- ***opt_is -*** index set associated with the optimization variables (`NULL` if not needed)
- ***slack_is -*** index set associated with the slack variables (`NULL` if not needed)





## See Also
 `TAOALMM`, `Tao`, `IS`, `TaoALMMGetPrimalVector()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/constrained/impls/almm/almmutils.c.html#TaoALMMGetPrimalIS">src/tao/constrained/impls/almm/almmutils.c</A>


---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/tao/constrained/impls/almm/almmutils.c)


[Index of all Tao routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)  
