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# TaoALMMGetDualIS
Retrieve the index set that identifies equality and inequality constraint components of the dual vector returned by `TaoALMMGetMultipliers()`. 
## Synopsis
```
#include "petsctao.h" 
PetscErrorCode TaoALMMGetDualIS(Tao tao, IS *eq_is, IS *ineq_is)
```

## Input Parameter

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



## Output Parameters

- ***eq_is -*** index set associated with the equality constraints (`NULL` if not needed)
- ***ineq_is -*** index set associated with the inequality constraints (`NULL` if not needed)





## See Also
 `TAOALMM`, `Tao`, `TaoALMMGetMultipliers()`

## Level
advanced

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


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


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