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fix wrong simplex backtracking

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2014-05-09 08:51:07 -07:00
parent d2db8007d8
commit 05a39cb2cf
11 changed files with 231 additions and 56 deletions
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src/math/simplex/simplex.h
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@ -126,7 +126,7 @@ namespace simplex {
row get_infeasible_row();
var_t get_base_var(row const& r) const { return m_row2base[r.id()]; }
numeral const& get_base_coeff(row const& r) const { return m_vars[m_row2base[r.id()]].m_base_coeff; }
void del_row(row const& r);
void del_row(var_t base_var);
void set_lower(var_t var, eps_numeral const& b);
void set_upper(var_t var, eps_numeral const& b);
void get_lower(var_t var, scoped_eps_numeral& b) const { b = m_vars[var].m_lower; }
@ -157,6 +157,7 @@ namespace simplex {
private:
void del_row(row const& r);
var_t select_var_to_fix();
pivot_strategy_t pivot_strategy();
var_t select_smallest_var() { return m_to_patch.empty()?null_var:m_to_patch.erase_min(); }