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


## Input Parameter

- ***tagger -*** the VecTagger context



## Output Parameters

- ***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
 `VecTaggerCDFSetMethod()`

## Level
advanced

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


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