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# KSPCGLS
Conjugate Gradient method for Least-Squares problems. Supports non-square (rectangular) matrices. 


## Note
This does not use the preconditioner, so one should probably use `KSPLSQR` instead.


## See Also
 [](ch_ksp), `KSPLSQR`, `KSPCreate()`, `KSPSetType()`, `KSPType`, `KSP`,
`KSPCGSetType()`, `KSPCGUseSingleReduction()`, `KSPPIPECG`, `KSPGROPPCG`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/impls/cg/cgls.c.html#KSPCGLS">src/ksp/ksp/impls/cg/cgls.c</A>


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