hi_solver_get_dual_ray: Get the Dual Ray (Farkas Infeasibility Certificate)
In highs: 'HiGHS' Optimization Solver
hi_solver_get_dual_ray R Documentation
Get the Dual Ray (Farkas Infeasibility Certificate)
Description
For a primal-infeasible LP, returns the dual unbounded ray: a Farkas
certificate of primal infeasibility, with one entry per constraint (row).
Usage
hi_solver_get_dual_ray(solver)
Arguments
solver
An object of class "highs_solver".
Details
A dual ray is available only after an LP detected to be **infeasible** and
solved by the **simplex** method (the interior-point solver does not produce
a ray). Disable presolve, or rely on HiGHS's postsolve, to recover the ray on
the original model. Requesting the ray may solve an auxiliary LP.
Value
A list with 'status' (integer, 0 = OK), 'has_dual_ray' (logical), and
'dual_ray' (numeric vector of length 'n_row', or 'NULL' when no ray exists).
highs documentation built on June 8, 2026, 9:06 a.m.
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| hi_solver_get_dual_ray | R Documentation |
Get the Dual Ray (Farkas Infeasibility Certificate)
Description
For a primal-infeasible LP, returns the dual unbounded ray: a Farkas certificate of primal infeasibility, with one entry per constraint (row).
Usage
hi_solver_get_dual_ray(solver)
Arguments
solver |
An object of class "highs_solver". |
Details
A dual ray is available only after an LP detected to be **infeasible** and solved by the **simplex** method (the interior-point solver does not produce a ray). Disable presolve, or rely on HiGHS's postsolve, to recover the ray on the original model. Requesting the ray may solve an auxiliary LP.
Value
A list with 'status' (integer, 0 = OK), 'has_dual_ray' (logical), and 'dual_ray' (numeric vector of length 'n_row', or 'NULL' when no ray exists).
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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