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experiment with substituting zeros in Horner&Grobner

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2020-01-11 15:43:54 -08:00
parent 45c0f2225c
commit f0b530b0e4
4 changed files with 26 additions and 12 deletions
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12
src/math/lp/nla_common.cpp
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@ -125,9 +125,13 @@ unsigned common::random() {
// creates a nex expression for the coeff and var,
nex * common::nexvar(const rational & coeff, lpvar j, nex_creator& cn) {
SASSERT(!coeff.is_zero());
if (c().m_nla_settings.horner_subs_fixed() && c().var_is_fixed(j)) {
if (c().m_nla_settings.horner_subs_fixed() == 1 && c().var_is_fixed(j)) {
return cn.mk_scalar(coeff * c().m_lar_solver.column_lower_bound(j).x);
}
if (c().m_nla_settings.horner_subs_fixed() == 2 && c().var_is_fixed_to_zero(j)) {
return cn.mk_scalar(rational(0));
}
if (!c().is_monic_var(j)) {
c().insert_to_active_var_set(j);
return cn.mk_mul(cn.mk_scalar(coeff), cn.mk_var(j));
@ -138,7 +142,11 @@ nex * common::nexvar(const rational & coeff, lpvar j, nex_creator& cn) {
for (lpvar k : m.vars()) {
if (c().m_nla_settings.horner_subs_fixed() && c().var_is_fixed(k)) {
mf *= c().m_lar_solver.column_lower_bound(k).x;
} else {
} else if (c().m_nla_settings.horner_subs_fixed() == 2 &&
c().var_is_fixed_to_zero(j)) {
return cn.mk_scalar(rational(0));
}
else {
c().insert_to_active_var_set(k);
mf *= cn.mk_var(k);
CTRACE("nla_grobner", c().is_monic_var(k), c().print_var(k, tout) << "\n";);