# TSPseudoIncrementDtFromInitialDt
Indicates that a new timestep is computed via the formula $         dt = initial_dt*initial_fnorm/current_fnorm rather than the default update, $         dt = current_dt*previous_fnorm/current_fnorm. 
## Synopsis
```
#include "petscts.h"   
PetscErrorCode TSPseudoIncrementDtFromInitialDt(TS ts)
```
Logically Collective on ts


## Input Parameter

- ***ts -*** the timestep context



## Options Database Key

- ***-ts_pseudo_increment_dt_from_initial_dt <true,false> -*** use the initial dt to determine increment





## See Also
 [](chapter_ts), `TSPSEUDO`, `TSPseudoSetTimeStep()`, `TSPseudoTimeStepDefault()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/impls/pseudo/posindep.c.html#TSPseudoIncrementDtFromInitialDt">src/ts/impls/pseudo/posindep.c</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/impls/pseudo/posindep.c.html#TSPseudoIncrementDtFromInitialDt_Pseudo">TSPseudoIncrementDtFromInitialDt_Pseudo in src/ts/impls/pseudo/posindep.c</A><BR>


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


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