SQP Settings and Status

Settings

Field	Default	Description
globalization_strategy	LINE_SEARCH_FILTER	Full-step, L1 line-search, or filter line-search strategy.
hessian_approximation	GAUSS_NEWTON	Exact Lagrangian Hessian or Gauss-Newton approximation.
eps_prim	1e-6	Primal-step termination threshold.
eps_dual	1e-4	Dual-step termination threshold.
max_iter	1000	Maximum SQP iterations.
line_search_max_iter	100	Maximum line-search iterations per SQP step.
min_alpha	1e-4	Minimum accepted step size.
regularize_hessian	false	Enable Gershgorin-based Hessian regularization.
verbose	false	Print iteration progress and final status.

Additional fields control line-search, filter, watchdog, and elastic-mode behavior. Defaults are defined by laopt::sqp_settings_t<Scalar> in laopt/solvers/sqp_solver.hpp.

Status

Value	Meaning
SOLVED	Convergence criteria were satisfied.
MAX_ITER_REACHED	The iteration limit was reached.
INFEASIBLE	The problem was reported infeasible.
NON_CONVEX_QP	A QP subproblem was reported non-convex.
QP_SOLVER_ERROR	The selected QP backend returned an unhandled error.
UNSOLVED	The solver has not produced a result.
INVALID_SETTINGS	One or more settings failed validation.

solver.info() returns the status, SQP iteration count, and accumulated QP iteration count. The primal and dual solutions are available through primal(), dual(), and dual_bounds().