:orphan:
# TaoGetInitialTrustRegionRadius
Gets the initial trust region radius. 
## Synopsis
```
#include "petsctao.h" 
PetscErrorCode TaoGetInitialTrustRegionRadius(Tao tao, PetscReal *radius)
```
Not Collective


## Input Parameter

- ***tao -*** a `Tao` optimization solver



## Output Parameter

- ***radius -*** the trust region radius





## See Also
 [](ch_tao), `Tao`, `TaoSetInitialTrustRegionRadius()`, `TaoGetCurrentTrustRegionRadius()`, `TAONTR`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/interface/taosolver.c.html#TaoGetInitialTrustRegionRadius">src/tao/interface/taosolver.c</A>


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


[Index of all Tao routines](index.md)  
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[Index of all manual pages](/manualpages/singleindex.md)