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Expl (#4462)

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* cleaner API for explanation

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* remove an unnecessery check

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* expl

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2020-05-24 17:06:39 -07:00 • committed by GitHub
parent d6ad371934
commit 97b480ded3
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4 changed files with 63 additions and 38 deletions
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6
src/math/lp/lar_solver.cpp
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@ -307,8 +307,8 @@ void lar_solver::fill_explanation_from_crossed_bounds_column(explanation & evide
// this is the case when the lower bound is in conflict with the upper one
const ul_pair & ul = m_columns_to_ul_pairs[m_crossed_bounds_column];
evidence.add_with_coeff(ul.upper_bound_witness(), numeric_traits<mpq>::one());
evidence.add_with_coeff(ul.lower_bound_witness(), -numeric_traits<mpq>::one());
evidence.add_pair(ul.upper_bound_witness(), numeric_traits<mpq>::one());
evidence.add_pair(ul.lower_bound_witness(), -numeric_traits<mpq>::one());
}
@ -1195,7 +1195,7 @@ void lar_solver::get_infeasibility_explanation_for_inf_sign(
constraint_index bound_constr_i = adj_sign < 0 ? ul.upper_bound_witness() : ul.lower_bound_witness();
lp_assert(m_constraints.valid_index(bound_constr_i));
exp.add_with_coeff(bound_constr_i, coeff);
exp.add_pair(bound_constr_i, coeff);
}
}