Dear developers,<br><br>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:<br><br>1- How to update the TR bound?<br>2- How solving the minimization subproblem?<br>
3- How to calculate the search direction? Is the "dogleg" direction is used?<br><br>Thanks a lot,<br>BehZad<br>