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fix a bug in the lar_solver::m_status update during push/pop

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

progress in gomory cut

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

the first version of Gomory cut, probably broken

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

rename a function

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

gomory cut worked on a toy example

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

track the set of integer variables that are not set to integer values

Signed-off-by: Lev Nachmanson <levnach@microsoft.com>
This commit is contained in:
Lev Nachmanson 2017-07-10 16:34:23 -07:00 • committed by Lev Nachmanson
parent 0164ea9abb
commit aba7dcab3e
21 changed files with 682 additions and 455 deletions
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12
src/util/lp/lp_solver.hpp
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@ -238,7 +238,7 @@ template <typename T, typename X> bool lp_solver<T, X>::row_e_is_obsolete(std
T rs = m_constraints[row_index].m_rs;
if (row_is_zero(row)) {
if (!is_zero(rs))
m_status = INFEASIBLE;
m_status = lp_status::INFEASIBLE;
return true;
}
@ -248,7 +248,7 @@ template <typename T, typename X> bool lp_solver<T, X>::row_e_is_obsolete(std
T diff = low_bound - rs;
if (!val_is_smaller_than_eps(diff, m_settings.refactor_tolerance)){
// low_bound > rs + m_settings.refactor_epsilon
m_status = INFEASIBLE;
m_status = lp_status::INFEASIBLE;
return true;
}
if (val_is_smaller_than_eps(-diff, m_settings.refactor_tolerance)){
@ -263,7 +263,7 @@ template <typename T, typename X> bool lp_solver<T, X>::row_e_is_obsolete(std
T diff = rs - upper_bound;
if (!val_is_smaller_than_eps(diff, m_settings.refactor_tolerance)) {
// upper_bound < rs - m_settings.refactor_tolerance
m_status = INFEASIBLE;
m_status = lp_status::INFEASIBLE;
return true;
}
if (val_is_smaller_than_eps(-diff, m_settings.refactor_tolerance)){
@ -279,7 +279,7 @@ template <typename T, typename X> bool lp_solver<T, X>::row_ge_is_obsolete(std:
T rs = m_constraints[row_index].m_rs;
if (row_is_zero(row)) {
if (rs > zero_of_type<X>())
m_status = INFEASIBLE;
m_status = lp_status::INFEASIBLE;
return true;
}
@ -288,7 +288,7 @@ template <typename T, typename X> bool lp_solver<T, X>::row_ge_is_obsolete(std:
T diff = rs - upper_bound;
if (!val_is_smaller_than_eps(diff, m_settings.refactor_tolerance)) {
// upper_bound < rs - m_settings.refactor_tolerance
m_status = INFEASIBLE;
m_status = lp_status::INFEASIBLE;
return true;
}
if (val_is_smaller_than_eps(-diff, m_settings.refactor_tolerance)){
@ -305,7 +305,7 @@ template <typename T, typename X> bool lp_solver<T, X>::row_le_is_obsolete(std::
T rs = m_constraints[row_index].m_rs;
if (row_is_zero(row)) {
if (rs < zero_of_type<X>())
m_status = INFEASIBLE;
m_status = lp_status::INFEASIBLE;
return true;
}