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# KSPSetDMActive
Indicates the `DM` should be used to generate the linear system matrix and right hand side vector
## Synopsis
```
#include "petscksp.h"
PetscErrorCode KSPSetDMActive(KSP ksp, PetscBool flg)
```
Logically Collective
## Input Parameters
- ***ksp -*** the `KSP`
- ***flg -*** use the `DM`
## Note
By default `KSPSetDM()` sets the `DM` as active, call `KSPSetDMActive`(ksp,`PETSC_FALSE`); after `KSPSetDM`(ksp,dm) to not have the `KSP` object use the `DM` to generate the matrices.
## See Also
[](ch_ksp), `KSP`, `DM`, `KSPGetDM()`, `KSPSetDM()`, `SNESSetDM()`, `KSPSetComputeOperators()`, `KSPSetComputeRHS()`, `KSPSetComputeInitialGuess()`
## Level
intermediate
## Location
src/ksp/ksp/interface/iterativ.c
## Examples
src/dm/impls/stag/tutorials/ex4.c
src/dm/impls/stag/tutorials/ex8.c
src/ksp/ksp/tutorials/ex29.c
src/ksp/ksp/tutorials/ex43.c
src/ksp/ksp/tutorials/ex70.c
src/ksp/ksp/tutorials/ex73.c
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[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)