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107 lines (102 loc) · 4.14 KB
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#include <symengine/add.h>
#include <symengine/pow.h>
#include <symengine/rings.h>
#include <symengine/monomials.h>
#include <symengine/symengine_exception.h>
namespace SymEngine
{
void expr2poly(const RCP<const Basic> &p, umap_basic_num &syms, umap_vec_mpz &P)
{
if (is_a<Add>(*p)) {
auto n = syms.size();
const umap_basic_num &d = down_cast<const Add &>(*p).get_dict();
vec_int exp;
integer_class coef;
for (const auto &p : d) {
if (not is_a<Integer>(*p.second))
throw NotImplementedError("Not Implemented");
coef = down_cast<const Integer &>(*p.second).as_integer_class();
exp.assign(n, 0); // Initialize to [0]*n
if (is_a<Mul>(*p.first)) {
const map_basic_basic &term
= down_cast<const Mul &>(*p.first).get_dict();
for (const auto &q : term) {
RCP<const Basic> sym = q.first;
if (not is_a<Integer>(*syms.at(sym)))
throw NotImplementedError("Not Implemented");
int i = numeric_cast<int>(
down_cast<const Integer &>(*syms.at(sym)).as_int());
if (is_a<Integer>(*q.second)) {
exp[i] = numeric_cast<int>(
down_cast<const Integer &>(*q.second).as_int());
} else {
throw SymEngineException(
"Cannot convert symbolic exponents to sparse "
"polynomials with integer exponents.");
}
}
} else if (is_a<Pow>(*p.first)) {
RCP<const Basic> sym
= down_cast<const Pow &>(*p.first).get_base();
RCP<const Basic> exp_
= down_cast<const Pow &>(*p.first).get_exp();
if (not is_a<Integer>(*syms.at(sym)))
throw NotImplementedError("Not Implemented");
int i = numeric_cast<int>(
down_cast<const Integer &>(*syms.at(sym)).as_int());
if (not is_a<Integer>(*exp_))
throw NotImplementedError("Not Implemented");
exp[i] = numeric_cast<int>(
down_cast<const Integer &>(*exp_).as_int());
} else if (is_a<Symbol>(*p.first)) {
RCP<const Basic> sym = p.first;
if (not is_a<Integer>(*syms.at(sym)))
throw NotImplementedError("Not Implemented");
int i = numeric_cast<int>(
down_cast<const Integer &>(*syms.at(sym)).as_int());
exp[i] = 1;
} else {
throw NotImplementedError("Not Implemented");
}
P[exp] = coef;
}
} else {
throw NotImplementedError("Not Implemented");
}
}
void poly_mul(const umap_vec_mpz &A, const umap_vec_mpz &B, umap_vec_mpz &C)
{
vec_int exp;
auto n = A.begin()->first.size();
exp.assign(n, 0); // Initialize to [0]*n
/*
std::cout << "A: " << A.load_factor() << " " << A.bucket_count() << " " <<
A.size() << " "
<< A.max_bucket_count() << std::endl;
std::cout << "B: " << B.load_factor() << " " << B.bucket_count() << " " <<
B.size() << " "
<< B.max_bucket_count() << std::endl;
std::cout << "C: " << C.load_factor() << " " << C.bucket_count() << " " <<
C.size() << " "
<< C.max_bucket_count() << std::endl;
*/
for (const auto &a : A) {
for (const auto &b : B) {
monomial_mul(a.first, b.first, exp);
mp_addmul(C[exp], a.second, b.second);
}
}
/*
std::cout << "C: " << C.load_factor() << " " << C.bucket_count() << " " <<
C.size() << " "
<< C.max_bucket_count() << std::endl;
for (const std::size_t n=0; n < C.bucket_count(); n++) {
std::cout << n << ": " << C.bucket_size(n) << "|";
for (auto it = C.begin(n); it != C.end(n); ++it)
std::cout << " " << it->first << myhash2(it->first) %
C.bucket_count();
std::cout << std::endl;
}
*/
}
} // namespace SymEngine