inst/HiGHS/docs/src/structures/structs/HighsInfo.md

In Uno: R Interface to the 'Uno' Nonlinear Optimization Solver

HighsInfo

Scalar information about a solved model is communicated via an instance of the HighsInfo structure

valid

• Indicates whether the values in a HighsInfo instance are valid
• Type: bool

simplex_iteration_count

• The number of simplex iterations performed
• Type: integer

ipm_iteration_count

• The number of interior point iterations performed
• Type: integer

crossover_iteration_count

• The number of crossover iterations performed
• Type: integer

pdlp_iteration_count

• The number of PDLP iterations performed
• Type: integer

qp_iteration_count

• The number of QP iterations performed
• Type: integer

primal_solution_status

• Comparison with SolutionStatus gives the status of the primal solution
• Type: integer

dual_solution_status

• Comparison with SolutionStatus gives the status of the dual solution
• Type: integer

basis_validity

• Comparison with BasisValidity gives the status of any basis information
• Type: integer

objective_function_value

• The optimal value of the objective function
• Type: double

mip_node_count

• The number of nodes generated by the MIP solver
• Type: long integer

mip_dual_bound

• The dual bound for the MIP solver
• Type: double

mip_gap

• The absolute value of the gap between the primal and bounds, relative to the primal bound.
• Type: double

max_integrality_violation

• The maximum deviation from an integer value over all the discrete variables
• Type: double

num_primal_infeasibilities

• The number of variables violating a bound by more than the primal feasibility tolerance.
• Type: integer

max_primal_infeasibility

• The maximum violation of a bound on a variable
• Type: double

sum_primal_infeasibilities

• The sum of violations of bounds by variables
• Type: double

num_dual_infeasibilities

• The number of variables violating dual feasibility by more than the dual feasibility tolerance.
• Type: integer

max_dual_infeasibility

• The maximum violation of dual feasibility
• Type: double

sum_dual_infeasibilities

• The sum of violations of dual feasibility
• Type: double

num_relative_primal_infeasibilities

• The number of variables violating a bound by relatively more than the primal feasibility tolerance.
• Type: integer

max_relative_primal_infeasibility

• The maximum relative violation of a bound on a variable
• Type: double

num_relative_dual_infeasibilities

• The number of variables violating dual feasibility by relatively more than the dual feasibility tolerance.
• Type: integer

max_relative_dual_infeasibility

• The maximum relative violation of dual feasibility
• Type: double

num_primal_residual_errors

• The number of primal equations violated by more than the primal residual tolerance.
• Type: integer

max_primal_residual_error

• The maximum violation of primal equations
• Type: double

num_dual_residual_errors

• The number of dual equations violated by more than the dual residual tolerance.
• Type: integer

max_dual_residual_error

• The maximum violation of dual equations
• Type: double

num_relative_primal_residual_errors

• The number of primal equations violated by relatively more than the primal residual tolerance.
• Type: integer

max_relative_primal_residual_error

• The maximum relative violation of primal equations
• Type: double

num_relative_dual_residual_errors

• The number of dual equations violated by relatively more than the dual residual tolerance.
• Type: integer

max_relative_dual_residual_error

• The maximum relative violation of dual equations
• Type: double

num_complementarity_violations

• The number of violations of primal-dual complementarity
• Type: integer

max_complementarity_violation

• The maximum primal-dual complementarity violation
• Type: double

primal_dual_objective_error

• The relative difference between the primal and dual objective values
• Type: double

primal_dual_integral

• The primal-dual integral for MIPs
• Type: double

Uno documentation built on Aug. 30, 2026, 5:07 p.m.