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# ISComplementVec
Creates the complement of the index set relative to a layout defined by a `Vec` 
## Synopsis
```
#include "petscvec.h"  
PetscErrorCode ISComplementVec(IS S, Vec V, IS *T)
```
Collective


## Input Parameters

- ***S -*** a PETSc `IS`
- ***V -*** the reference vector space



## Output Parameter

- ***T -*** the complement of S





## See Also
 `IS`, `Vec`, `ISCreateGeneral()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/utils/projection.c.html#ISComplementVec">src/vec/vec/utils/projection.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/vec/utils/projection.c)


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