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# DMKSPSetComputeOperators
set `KSP` matrix evaluation function 
## Synopsis
```
#include "petscksp.h" 
PetscErrorCode DMKSPSetComputeOperators(DM dm, PetscErrorCode (*func)(KSP, Mat, Mat, void *), void *ctx)
```
Not Collective


## Input Parameters

- ***dm -*** `DM` to be used with `KSP`
- ***func -*** matrix evaluation function,  for calling sequence see `KSPSetComputeOperators()`
- ***ctx -*** context for matrix evaluation





## Note
`KSPSetComputeOperators()` is normally used, but it calls this function internally because the user context is actually
associated with the `DM`.  This makes the interface consistent regardless of whether the user interacts with a `DM` or
not.


## Developer Note
If `DM` took a more central role at some later date, this could become the primary method of setting the matrix.


## See Also
 [](ch_ksp), `DMKSP`, `DM`, `KSP`, `DMKSPSetContext()`, `DMKSPGetComputeOperators()`, `KSPSetOperators()`

## Level
developer

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


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