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fixes in horner's heuristic

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2019-08-06 11:41:37 -07:00
parent c95f66e02a
commit 207c1c509f
6 changed files with 64 additions and 17 deletions
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7
src/math/lp/nla_expr.h
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@ -376,17 +376,20 @@ public:
return *this;
}
bool sum_is_linear() const {
bool sum_is_a_linear_term() const {
SASSERT(is_sum());
int degree = 0;
unsigned number_of_non_scalars = 0;
for (auto & e : children()) {
int d = e.get_degree();
if (d > 1)
return false;
if (d > degree)
degree = d;
if (!e.is_scalar())
number_of_non_scalars++;
}
return degree == 1;
return degree == 1 && number_of_non_scalars > 1;
}
int get_degree() const {