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# VECNEST
VECNEST = "nest" - Vector type consisting of nested subvectors, each stored separately. 


## Notes
This vector type reduces the number of copies for certain solvers applied to multi-physics problems.
It is usually used with `MATNEST` and `DMCOMPOSITE` via `DMSetVecType()`.


## See Also
 [](ch_vectors), `Vec`, `VecType`, `VecCreate()`, `VecType`, `VecCreateNest()`, `MatCreateNest()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/impls/nest/vecnest.c.html#VECNEST">src/vec/vec/impls/nest/vecnest.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex27.c.html">src/ksp/ksp/tutorials/ex27.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/vec/impls/nest/vecnest.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)