# KSPLSQRMonitorResidual
Prints the residual norm, as well as the normal equation residual norm, at each iteration of an iterative solver for the `KSPLSQR` solver 
## Synopsis
```
#include "petscksp.h" 
PetscErrorCode KSPLSQRMonitorResidual(KSP ksp, PetscInt n, PetscReal rnorm, PetscViewerAndFormat *vf)
```
Collective


## Input Parameters

- ***ksp   -*** iterative context
- ***n     -*** iteration number
- ***rnorm -*** 2-norm (preconditioned) residual value (may be estimated).
- ***vf    -*** The viewer context



## Options Database Key

- ***-ksp_lsqr_monitor -*** Activates `KSPLSQRMonitorResidual()`





## See Also
 [](chapter_ksp), `KSPLSQR`, `KSPMonitorSet()`, `KSPMonitorResidual()`, `KSPMonitorTrueResidualMaxNorm()`, `KSPLSQRMonitorResidualDrawLG()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/impls/lsqr/lsqr.c.html#KSPLSQRMonitorResidual">src/ksp/ksp/impls/lsqr/lsqr.c</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/impls/lsqr/lsqr.c.html#KSPLSQRMonitorResidual_LSQR">KSPLSQRMonitorResidual_LSQR in src/ksp/ksp/impls/lsqr/lsqr.c</A><BR>


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


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