[petsc-users] Need to Know about Trust-Region

[behzad baghapour]

Dear developers,

In Petsc user manual, it was mentioned that Trust-Region Method is working
upon MINPACK routines. I need to know more details of the procedure like:

1- How to update the TR bound?
2- How solving the minimization subproblem?
3- How to calculate the search direction? Is the "dogleg" direction is used?

Thanks a lot,
BehZad
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