# TSMonitorLGError
Monitors progress of the `TS` solvers by plotting each component of the error in a time based line graph 
## Synopsis
```
#include "petscts.h"  
PetscErrorCode TSMonitorLGError(TS ts, PetscInt step, PetscReal ptime, Vec u, void *dummy)
```
Collective on ts


## Input Parameters

- ***ts -*** the `TS` context
- ***step -*** current time-step
- ***ptime -*** current time
- ***u -*** current solution
- ***dctx -*** `TSMonitorLGCtx` object created with `TSMonitorLGCtxCreate()`



## Options Database Key

- ***-ts_monitor_lg_error -*** create a graphical monitor of error history





## Notes
Each process in a parallel run displays its component errors in a separate window

The user must provide the solution using `TSSetSolutionFunction()` to use this monitor.

This is not called directly by users, rather one calls `TSMonitorSet()`, with this function as an argument, to cause the monitor
to be used during the TS integration.


## See Also
 [](chapter_ts), `TS`, `TSMonitorSet()`, `TSMonitorDefault()`, `VecView()`, `TSSetSolutionFunction()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/interface/tsmon.c.html#TSMonitorLGError">src/ts/interface/tsmon.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ts/interface/tsmon.c)


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