.. index:: single: barrier_sub_problem(Problem,OuterIteration,StartPoint,Mu,Rho,Sign) .. _barrier_sub_problem/6:

.. rst-class:: right

object

barrier_sub_problem(Problem,OuterIteration,StartPoint,Mu,Rho,Sign)

• Problem - The original constrained problem.
• OuterIteration - One-based outer iteration number.
• StartPoint - Point the inner solve should start from (the current outer iterate, always strictly feasible with respect to the inequality constraints).
• Mu - Current barrier weight.
• Rho - Current equality-penalty weight.
• Sign - 1.0 to minimize the original objective, -1.0 to maximize it. Internal log-barrier subproblem: objective(x) = Sign*f(x) - mu*sum_j log(-h_j(x)) + (rho/2)*||g(x)||^2, with the barrier term replaced, per inequality constraint, by a smooth large-coefficient quadratic penalty whenever that constraint is not comfortably strictly satisfied. Instantiated fresh by log_barrier(_,_) every outer iteration, starting from StartPoint (the previous outer iterate); not meant to be used directly.

  | Availability: | logtalk_load(constrained_optimization(loader))

  | Author: Paulo Moura | Version: 1:0:0 | Date: 2026-09-03

  | Compilation flags: | static, context_switching_calls

  | Implements: | public :ref:`local_optimization_problem_protocol <local_optimization_problem_protocol/0>` | Imports: | public :ref:`constrained_optimization_solver <constrained_optimization_solver/0>` | Uses: | :ref:`linear_algebra <linear_algebra/0>` | :ref:`list <list/0>`

  | Remarks: | (none)

  | Inherited public predicates: | Â :ref:`local_optimization_problem_protocol/0::gradient/2` Â :ref:`local_optimization_problem_protocol/0::hessian/2` Â :ref:`local_optimization_problem_protocol/0::initial_point/1` Â :ref:`local_optimization_problem_protocol/0::objective/2` Â :ref:`local_optimization_problem_protocol/0::position_bounds/1` Â :ref:`local_optimization_problem_protocol/0::progress/5` Â :ref:`local_optimization_problem_protocol/0::stop_condition/3` Â

  .. contents:: :local: :backlinks: top

Public predicates

(no local declarations; see entity ancestors if any)

Protected predicates

(no local declarations; see entity ancestors if any)

Private predicates

(no local declarations; see entity ancestors if any)

Operators

(none)