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# PCSVD
Use pseudo inverse defined by SVD of operator 


## Options Database Keys

- ***-pc_svd_zero_sing <rtol> -*** Singular values smaller than this are treated as zero
- ***-pc_svd_monitor -*** Print information on the extreme singular values of the operator



## Developer Note
This implementation automatically creates a redundant copy of the
matrix on each process and uses a sequential SVD solve. Why does it do this instead
of using the composable `PCREDUNDANT` object?


## See Also
 `PCCreate()`, `PCSetType()`, `PCType`, `PC`, `PCREDUNDANT`

## Level
advanced

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


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