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# VecTaggerCDFIterativeSetTolerances
Set the tolerances for iterative computation of absolute boxes from CDF boxes. 
## Synopsis
```
#include "petscvec.h" 
PetscErrorCode VecTaggerCDFIterativeSetTolerances(VecTagger tagger, PetscInt maxit, PetscReal rtol, PetscReal atol)
```
Logically Collective


## Input Parameters

- ***tagger -*** the `VecTagger` context
- ***maxit -*** the maximum number of iterations: 0 indicates the absolute values will be estimated from an initial guess based only on the minimum, maximum, mean,
and standard deviation of the box endpoints.
- ***rtol -*** the acceptable relative tolerance in the absolute values from the initial guess
- ***atol -*** the acceptable absolute tolerance in the absolute values from the initial guess





## See Also
 `VecTagger`, `VecTaggerCDFSetMethod()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/utils/tagger/impls/cdf.c.html#VecTaggerCDFIterativeSetTolerances">src/vec/vec/utils/tagger/impls/cdf.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/vec/utils/tagger/impls/cdf.c)


[Index of all Vec routines](index.md)  
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