:orphan:
# KSPSetDM
Sets the `DM` that may be used by some preconditioners 
## Synopsis
```
#include "petscksp.h" 
PetscErrorCode KSPSetDM(KSP ksp, DM dm)
```
Logically Collective


## Input Parameters

- ***ksp -*** the `KSP`
- ***dm -*** the `DM`, cannot be `NULL` to remove a previously set `DM`





## Notes
If this is used then the `KSP` will attempt to use the `DM` to create the matrix and use the routine set with
`DMKSPSetComputeOperators()`. Use `KSPSetDMActive`(ksp,`PETSC_FALSE`) to instead use the matrix you've provided with
`KSPSetOperators()`.

A `DM` can only be used for solving one problem at a time because information about the problem is stored on the `DM`,
even when not using interfaces like `DMKSPSetComputeOperators()`.  Use `DMClone()` to get a distinct `DM` when solving
different problems using the same function space.


## See Also
 [](ch_ksp), `KSP`, `DM`, `KSPGetDM()`, `KSPSetDMActive()`, `KSPSetComputeOperators()`, `KSPSetComputeRHS()`, `KSPSetComputeInitialGuess()`, `DMKSPSetComputeOperators()`, `DMKSPSetComputeRHS()`, `DMKSPSetComputeInitialGuess()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/interface/iterativ.c.html#KSPSetDM">src/ksp/ksp/interface/iterativ.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/stag/tutorials/ex4.c.html">src/dm/impls/stag/tutorials/ex4.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/stag/tutorials/ex8.c.html">src/dm/impls/stag/tutorials/ex8.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex22f.F90.html">src/ksp/ksp/tutorials/ex22f.F90</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex25.c.html">src/ksp/ksp/tutorials/ex25.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex28.c.html">src/ksp/ksp/tutorials/ex28.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex29.c.html">src/ksp/ksp/tutorials/ex29.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex32.c.html">src/ksp/ksp/tutorials/ex32.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex34.c.html">src/ksp/ksp/tutorials/ex34.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex35.cxx.html">src/ksp/ksp/tutorials/ex35.cxx</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex36.cxx.html">src/ksp/ksp/tutorials/ex36.cxx</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex43.c.html">src/ksp/ksp/tutorials/ex43.c</A><BR>


---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ksp/ksp/interface/iterativ.c)


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