Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
use special bounds inf find_cube for x+y, x-y
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
bug fixes in column patching, add stats to patching, restructure int_solver
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
comment out m_old_values from int_solver
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
avoid calling pivot_fixed_vars_from_basis() in int_solver
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
fix the return value from path_nbasic_columns
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
fix the return value from path_nbasic_columns
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
work in patch_columns
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
work on int_solver check()
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
exit from find_free_interval() when l >= u
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
experiment with branching on nbasic columns
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
remove m_old_values
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
add rounding to patch_columns
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
qflia
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
patch all columns, round non-patched, branch or basic columns
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
refactor int_solver::check()
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
restore move_non_basic_columns_to_bounds() after a failure in find_cube()
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
optimize gomory cuts search
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
produce gomory cuts without moving columns to bounds
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
call find_feasible_solution() after moving columns
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
alway move colums to bounds before gomory cut
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
merge from best branch
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
Signed-off-by: Lev Nachmanson <levnach@microsoft.com>
handle integer vars in random_update
Signed-off-by: Lev Nachmanson <levnach@microsoft.com>
call the assert in gomory_cut and branching to a correct place
Signed-off-by: Lev Nachmanson <levnach@microsoft.com>
fixes in goromy cut
Signed-off-by: Lev Nachmanson <levnach@microsoft.com>
disable x values tracking in random_update
Signed-off-by: Lev Nachmanson <levnach@microsoft.com>
more fixes in gomory cut
Signed-off-by: Lev Nachmanson <levnach@microsoft.com>
change in mk_bound by Nikolaj
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
fixes in gomory cut and setup
Signed-off-by: Lev Nachmanson <levnach@microsoft.com>
fixes in int_solver
Signed-off-by: Lev Nachmanson <levnach@microsoft.com>
change a printout
Signed-off-by: Lev Nachmanson <levnach@microsoft.com>
fix by Nikolaj in treating terms returned by int_solver
Signed-off-by: Lev Nachmanson <levnach@microsoft.com>
fix syntax
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
fix a free coefficient bug in bound propagaion and simplify gomory cut
Signed-off-by: Lev Nachmanson <levnach@microsoft.com>
avoid tracking pivoted rows during int_solver::check()
