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# TAOPOUNDERS
POUNDERS derivate-free model-based algorithm for nonlinear least squares 
## Options Database Keys

- ***-tao_pounders_delta -*** initial step length
- ***-tao_pounders_npmax -*** maximum number of points in model
- ***-tao_pounders_gqt -*** use gqt algorithm for subproblem instead of TRON





## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/leastsquares/impls/pounders/pounders.c.html#TAOPOUNDERS">src/tao/leastsquares/impls/pounders/pounders.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/leastsquares/tutorials/chwirut1.c.html">src/tao/leastsquares/tutorials/chwirut1.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/leastsquares/tutorials/chwirut1f.F90.html">src/tao/leastsquares/tutorials/chwirut1f.F90</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/leastsquares/tutorials/chwirut2.c.html">src/tao/leastsquares/tutorials/chwirut2.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/leastsquares/tutorials/chwirut2f.F90.html">src/tao/leastsquares/tutorials/chwirut2f.F90</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/tao/leastsquares/impls/pounders/pounders.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)