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# PCKACZMARZ
Kaczmarz iteration 
## Options Database Keys

- ***-pc_kaczmarz_lambda <1.0> -*** Sets damping parameter lambda
- ***-pc_kaczmarz_symmetric -*** Apply row projections symmetrically





## Note
In parallel this is block-Jacobi with Kaczmarz inner solve.


## References

- **** -*** S. Kaczmarz, "Angenaherte Auflosing von Systemen Linearer Gleichungen",
Bull. Internat. Acad. Polon. Sci. C1. A, 1937.



## See Also
 `PCCreate()`, `PCSetType()`, `PCType`, `PC`, `PCJACOBI`, `PCBJACOBI`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/kaczmarz/kaczmarz.c.html#PCKACZMARZ">src/ksp/pc/impls/kaczmarz/kaczmarz.c</A>


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


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