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# TAOBNTR
Bounded Newton Trust Region for nonlinear minimization with bound constraints. 
## Options Database Keys

- ***-tao_bnk_max_cg_its -*** maximum number of bounded conjugate-gradient iterations taken in each Newton loop
- ***-tao_bnk_init_type -*** trust radius initialization method ("constant", "direction", "interpolation")
- ***-tao_bnk_update_type -*** trust radius update method ("step", "direction", "interpolation")
- ***-tao_bnk_as_type -*** active-set estimation method ("none", "bertsekas")




## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/bound/impls/bnk/bntr.c.html#TAOBNTR">src/tao/bound/impls/bnk/bntr.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/tao/bound/impls/bnk/bntr.c)


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