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propagate only one non-fixed monomial intrernally

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lar_solver
This commit is contained in:
Lev Nachmanson 2023-09-28 17:24:34 -07:00
parent 29b5c47a8d
commit f30a2c13be
4 changed files with 23 additions and 82 deletions
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20
src/math/lp/monomial_bounds.cpp
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@ -12,6 +12,26 @@
#include "math/lp/nla_intervals.h"
namespace nla {
// here non_fixed is the only non-fixed variable in the monomial,
// vars is the vector of the monomial variables,
// k is the product of all fixed variables in vars
void monomial_bounds::propagate_nonfixed(lpvar monic_var, const svector<lpvar>& vars, lpvar non_fixed, const rational& k) {
vector<std::pair<lp::mpq, unsigned>> coeffs;
coeffs.push_back(std::make_pair(-k, non_fixed));
coeffs.push_back(std::make_pair(rational::one(), monic_var));
lp::lpvar term_index = c().lra.add_term(coeffs, UINT_MAX);
auto* dep = explain_fixed(vars, non_fixed);
term_index = c().lra.map_term_index_to_column_index(term_index);
c().lra.update_column_type_and_bound(term_index, lp::lconstraint_kind::EQ, mpq(0), dep);
}
u_dependency* monomial_bounds::explain_fixed(const svector<lpvar>& vars, lpvar non_fixed) {
u_dependency* dep = nullptr;
for (auto v : vars)
if (v != non_fixed)
dep = c().lra.join_deps(dep, c().lra.get_bound_constraint_witnesses_for_column(v));
return dep;
}
monomial_bounds::monomial_bounds(core* c):
common(c),