/usr/include/polymake/next/PuiseuxFraction.h is in libpolymake-dev-common 3.2r2-3.
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Ewgenij Gawrilow, Michael Joswig (Technische Universitaet Berlin, Germany)
http://www.polymake.org
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version: http://www.gnu.org/licenses/gpl.txt.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
--------------------------------------------------------------------------------
*/
#ifndef POLYMAKE_VALUATED_RATIONAL_FUNCTION_H
#define POLYMAKE_VALUATED_RATIONAL_FUNCTION_H
#include "polymake/Rational.h"
#include "polymake/RationalFunction.h"
#include "polymake/TropicalNumber.h"
#include "polymake/linalg.h"
namespace pm {
struct is_valuated_rational_function {};
namespace operations {
template <typename OpRef, typename T>
struct evaluate;
template <typename OpRef>
struct evaluate<OpRef,double>;
}
template <typename MinMax, typename Coefficient=Rational, typename Exponent=Rational>
class PuiseuxFraction {
public:
typedef RationalFunction<Coefficient, Exponent> rf_type;
protected:
rf_type rf;
public:
typedef typename rf_type::polynomial_type polynomial_type;
typedef Exponent exponent_type;
typedef Coefficient coefficient_type;
template <typename> friend struct spec_object_traits;
template <typename,bool,bool> friend struct choose_generic_object_traits;
template <typename> friend class std::numeric_limits;
template <typename T>
using fits_as_coefficient = typename rf_type::template fits_as_coefficient<T>;
template <typename T>
using fits_as_particle = typename rf_type::template fits_as_particle<T>;
template <typename T>
struct is_comparable
: bool_constant<fits_as_particle<T>::value || std::is_same<T, TropicalNumber<MinMax, Exponent>>::value> {};
template <typename T>
struct is_comparable_or_same
: bool_constant<is_comparable<T>::value || std::is_same<T, PuiseuxFraction>::value> {};
/// Construct a zero value.
PuiseuxFraction() : rf() {}
/// One argument which may be a coefficient-compatible type or a unipolynomial
template <typename T,
typename=typename std::enable_if<fits_as_particle<T>::value>::type>
explicit PuiseuxFraction(const T& t)
: rf(t) {}
PuiseuxFraction(const rf_type& t)
: rf(numerator(t),denominator(t)) {}
/// Two arguments which may be coefficient-compatible type or unipolynomial
template <typename T1, typename T2,
typename=typename std::enable_if<fits_as_particle<T1>::value && fits_as_particle<T2>::value>::type>
PuiseuxFraction(const T1& t1, const T2& t2)
: rf(t1, t2) {}
template <typename T,
typename=typename std::enable_if<fits_as_particle<T>::value>::type>
PuiseuxFraction& operator= (const T& t)
{
rf = rf_type(t);
return *this;
}
const int orientation()
{
return MinMax::orientation();
}
friend
const polynomial_type& numerator(const PuiseuxFraction& me) { return numerator(me.rf); }
friend
const polynomial_type& denominator(const PuiseuxFraction& me) { return denominator(me.rf); }
void swap(PuiseuxFraction& other)
{
rf.swap(other);
}
PuiseuxFraction& negate()
{
rf.negate();
return *this;
}
friend
PuiseuxFraction operator- (const PuiseuxFraction& me)
{
return PuiseuxFraction(-me.rf);
}
/// PLUS
template <typename T,
typename=typename std::enable_if<fits_as_particle<T>::value>::type>
PuiseuxFraction& operator+= (const T& r)
{
rf += r;
return *this;
}
PuiseuxFraction& operator+= (const PuiseuxFraction& r)
{
rf += r.rf;
return *this;
}
template <typename T,
typename=typename std::enable_if<fits_as_particle<T>::value>::type>
friend
PuiseuxFraction operator+ (const PuiseuxFraction& l, const T& r)
{
return PuiseuxFraction(l.rf + r);
}
template <typename T,
typename=typename std::enable_if<fits_as_particle<T>::value>::type>
friend
PuiseuxFraction operator+ (const T& l, const PuiseuxFraction& r)
{
return PuiseuxFraction(l + r.rf);
}
friend
PuiseuxFraction operator+ (const PuiseuxFraction& l, const PuiseuxFraction& r)
{
return PuiseuxFraction(l.rf + r.rf);
}
/// MINUS
template <typename T,
typename=typename std::enable_if<fits_as_particle<T>::value>::type>
PuiseuxFraction& operator-= (const T& r)
{
rf -= r;
return *this;
}
PuiseuxFraction& operator-= (const PuiseuxFraction& r)
{
rf -= r.rf;
return *this;
}
template <typename T,
typename=typename std::enable_if<fits_as_particle<T>::value>::type>
friend
PuiseuxFraction operator- (const PuiseuxFraction& l, const T& r)
{
return PuiseuxFraction(l.rf - r);
}
template <typename T,
typename=typename std::enable_if<fits_as_particle<T>::value>::type>
friend
PuiseuxFraction operator- (const T& l, const PuiseuxFraction& r)
{
return PuiseuxFraction(l - r.rf);
}
friend
PuiseuxFraction operator- (const PuiseuxFraction& l, const PuiseuxFraction& r)
{
return PuiseuxFraction(l.rf - r.rf);
}
/// MULTIPLICATION
template <typename T,
typename=typename std::enable_if<fits_as_particle<T>::value>::type>
PuiseuxFraction& operator*= (const T& r)
{
rf *= r;
return *this;
}
PuiseuxFraction& operator*= (const PuiseuxFraction& r)
{
rf *= r.rf;
return *this;
}
template <typename T,
typename=typename std::enable_if<fits_as_particle<T>::value>::type>
friend
PuiseuxFraction operator* (const PuiseuxFraction& l, const T& r)
{
return PuiseuxFraction(l.rf * r);
}
template <typename T,
typename=typename std::enable_if<fits_as_particle<T>::value>::type>
friend
PuiseuxFraction operator* (const T& l, const PuiseuxFraction& r)
{
return PuiseuxFraction(l * r.rf);
}
friend
PuiseuxFraction operator* (const PuiseuxFraction& l, const PuiseuxFraction& r)
{
return PuiseuxFraction(l.rf * r.rf);
}
/// DIVISION
template <typename T,
typename=typename std::enable_if<fits_as_particle<T>::value>::type>
PuiseuxFraction& operator/= (const T& r)
{
rf /= r;
return *this;
}
PuiseuxFraction& operator/= (const PuiseuxFraction& r)
{
rf /= r.rf;
return *this;
}
template <typename T,
typename=typename std::enable_if<fits_as_particle<T>::value>::type>
friend
PuiseuxFraction operator/ (const PuiseuxFraction& l, const T& r)
{
return PuiseuxFraction(l.rf / r);
}
template <typename T,
typename=typename std::enable_if<fits_as_particle<T>::value>::type>
friend
PuiseuxFraction operator/ (const T& l, const PuiseuxFraction& r)
{
return PuiseuxFraction(l / r.rf);
}
friend
PuiseuxFraction operator/ (const PuiseuxFraction& l, const PuiseuxFraction& r)
{
return PuiseuxFraction(l.rf / r.rf);
}
/// EQUALITY
friend
bool operator== (const PuiseuxFraction& l, const PuiseuxFraction& r)
{
return l.rf == r.rf;
}
template <typename T,
typename=typename std::enable_if<fits_as_particle<T>::value>::type>
friend
bool operator== (const PuiseuxFraction& l, const T& r)
{
return l.rf == r;
}
friend
bool operator== (const PuiseuxFraction& l, const TropicalNumber<MinMax, Exponent>& r)
{
return l.val() == r;
}
template <typename T,
typename=typename std::enable_if<is_comparable<T>::value>::type>
friend
bool operator== (const T& l, const PuiseuxFraction& r)
{
return r==l;
}
template <typename T,
typename=typename std::enable_if<is_comparable_or_same<T>::value>::type>
friend
bool operator!= (const PuiseuxFraction& l, const T& r)
{
return !(l == r);
}
template <typename T,
typename=typename std::enable_if<is_comparable<T>::value>::type> friend
bool operator!= (const T& l, const PuiseuxFraction& r)
{
return !(r == l);
}
/// COMPARISON depending on Min / Max
// Max::orientation = -1 and we need the highest term
// Min::orientation = 1 and we need the lowest term
int compare(const PuiseuxFraction& vrf) const
{
if (std::is_same<Max, MinMax>::value)
return sign((numerator(rf)*denominator(vrf) - numerator(vrf)*denominator(rf)).lc());
else
return sign(denominator(rf).lc(-1)) * sign(denominator(vrf).lc(-1)) *
sign((numerator(rf)*denominator(vrf) - numerator(vrf)*denominator(rf)).lc(-1));
}
template <typename T>
typename std::enable_if<fits_as_coefficient<T>::value, int>::type
compare(const T& c) const
{
if (std::is_same<Max, MinMax>::value) {
if (!numerator(rf).trivial() && (is_zero(c) || numerator(rf).deg() > denominator(rf).deg()))
return sign(numerator(rf).lc());
else if (numerator(rf).deg() < denominator(rf).deg())
return -sign(c);
else
return sign(numerator(rf).lc()-c);
} else {
const Exponent minus_one = -one_value<Exponent>();
if (!numerator(rf).trivial() && (is_zero(c) || numerator(rf).lower_deg() < denominator(rf).lower_deg()))
return sign(numerator(rf).lc(minus_one)) * sign(denominator(rf).lc(minus_one));
else if (numerator(rf).lower_deg() > denominator(rf).lower_deg())
return -sign(c);
else
return sign(numerator(rf).lc(minus_one) * sign(denominator(rf).lc(minus_one)) - c*abs(denominator(rf).lc(minus_one)));
}
}
template <typename T>
typename std::enable_if<is_unipolynomial_type<T, Coefficient, Exponent>::value, int>::type
compare(const T& c) const
{
return compare(PuiseuxFraction(c));
}
int compare(const TropicalNumber<MinMax, Exponent>& c) const
{
return val().compare(c);
}
template <typename T,
typename=typename std::enable_if<is_comparable_or_same<T>::value>::type>
friend
bool operator< (const PuiseuxFraction& l, const T& r)
{
return l.compare(r) < 0;
}
template <typename T,
typename=typename std::enable_if<is_comparable<T>::value>::type>
friend
bool operator< (const T& l, const PuiseuxFraction& r)
{
return r.compare(l) > 0;
}
template <typename T,
typename=typename std::enable_if<is_comparable_or_same<T>::value>::type>
friend
bool operator<= (const PuiseuxFraction& l, const T& r)
{
return l.compare(r) <= 0;
}
template <typename T,
typename=typename std::enable_if<is_comparable<T>::value>::type>
friend
bool operator<= (const T& l, const PuiseuxFraction& r)
{
return r.compare(l) >= 0;
}
template <typename T,
typename=typename std::enable_if<is_comparable_or_same<T>::value>::type>
friend
bool operator> (const PuiseuxFraction& l, const T& r)
{
return l.compare(r) > 0;
}
template <typename T,
typename=typename std::enable_if<is_comparable<T>::value>::type>
friend
bool operator> (const T& l, const PuiseuxFraction& r)
{
return r.compare(l) < 0;
}
template <typename T,
typename=typename std::enable_if<is_comparable_or_same<T>::value>::type>
friend
bool operator>= (const PuiseuxFraction& l, const T& r)
{
return l.compare(r) >= 0;
}
template <typename T,
typename=typename std::enable_if<is_comparable<T>::value>::type> friend
bool operator>= (const T& l, const PuiseuxFraction& r)
{
return r.compare(l) <= 0;
}
static
const Array<std::string>& get_var_names()
{
return rf_type::get_var_names();
}
static
void set_var_names(const Array<std::string>& names)
{
rf_type::set_var_names(names);
}
static
void reset_var_names()
{
rf_type::reset_var_names();
}
static
void swap_var_names(PolynomialVarNames& other_names)
{
rf_type::swap_var_names(other_names);
}
template <typename Output> friend
Output& operator<< (GenericOutput<Output>& out, const PuiseuxFraction& vrf)
{
out.top() << '(';
numerator(vrf).print_ordered(out, -MinMax::orientation());
out.top() << ')';
if (!is_one(denominator(vrf))) {
out.top() << "/(";
denominator(vrf).print_ordered(out, -MinMax::orientation());
out.top() << ')';
}
return out.top();
}
rf_type to_rationalfunction() const
{
return rf;
}
TropicalNumber<MinMax, Exponent> val() const
{
if (std::is_same<MinMax, Max>::value)
return TropicalNumber<MinMax, Exponent>(numerator(rf).deg() - denominator(rf).deg());
else
return TropicalNumber<MinMax, Exponent>(numerator(rf).lower_deg() - denominator(rf).lower_deg());
}
friend PuiseuxFraction abs(const PuiseuxFraction& vrf)
{
return vrf >= 0 ? vrf : -vrf;
}
friend bool abs_equal(const PuiseuxFraction& vrf1, const PuiseuxFraction& vrf2)
{
return abs(vrf1).compare(abs(vrf2)) == 0;
}
// this evaluates at t^exp_lcm and exp_lcm must be large enough such that this makes all needed
// exponents integral
template <typename T,
typename=typename std::enable_if<fits_as_coefficient<T>::value>::type>
typename algebraic_traits<T>::field_type
evaluate_exp(const T& t, const long exp_lcm=1) const
{
typedef typename algebraic_traits<T>::field_type field;
field val = numerator(*this).evaluate(t,exp_lcm);
val /= denominator(*this).evaluate(t,exp_lcm);
return val;
}
double evaluate_float(const double arg) const
{
double val = numerator(*this).evaluate_float(arg);
val /= denominator(*this).evaluate_float(arg);
return val;
}
template <typename T>
typename std::enable_if<is_field_of_fractions<Exponent>::value && fits_as_coefficient<T>::value,
typename algebraic_traits<T>::field_type>::type
evaluate(const T& t, const long exp=1) const
{
Integer exp_lcm(exp);
exp_lcm = lcm(denominators(numerator(rf).monomials_as_vector() | denominator(rf).monomials_as_vector()) | exp_lcm);
const double t_approx = std::pow(convert_to<double>(t),1.0/convert_to<double>(exp_lcm));
Coefficient base = exp_lcm == exp ? t : t_approx;
return this->evaluate_exp(base, long(exp_lcm));
}
template <typename T>
typename std::enable_if<std::numeric_limits<Exponent>::is_integer && fits_as_coefficient<T>::value,
typename algebraic_traits<T>::field_type>::type
evaluate(const T& t, const long exp=1) const
{
return this->evaluate_exp(t, exp);
}
template <typename VectorType, typename T> static
typename std::enable_if<fits_as_coefficient<T>::value && is_field_of_fractions<Exponent>::value,
const LazyVector1<const VectorType&, operations::evaluate<PuiseuxFraction, typename algebraic_traits<T>::field_type> > >::type
evaluate(const GenericVector<VectorType, PuiseuxFraction>& vec, const T& t, const long exp=1)
{
Integer exp_lcm(exp);
for (typename Entire<VectorType>::const_iterator v = entire(vec.top()); !v.at_end(); ++v)
exp_lcm = lcm(denominators(numerator(*v).monomials_as_vector() | denominator(*v).monomials_as_vector()) | exp_lcm);
const double t_approx = std::pow(convert_to<double>(t),1.0/convert_to<double>(exp_lcm));
const typename algebraic_traits<T>::field_type base = exp_lcm == exp ? t : t_approx;
return LazyVector1<
const VectorType&,
operations::evaluate<PuiseuxFraction, typename algebraic_traits<T>::field_type>
>(vec.top(), operations::evaluate<PuiseuxFraction, typename algebraic_traits<T>::field_type>(base, long(exp_lcm)));
}
template <typename VectorType, typename T> static
typename std::enable_if<fits_as_coefficient<T>::value && std::numeric_limits<Exponent>::is_integer,
const LazyVector1<const VectorType&, operations::evaluate<PuiseuxFraction,T> > >::type
evaluate(const GenericVector<VectorType,PuiseuxFraction>& vec, const T& t, const long exp=1)
{
return LazyVector1<const VectorType&, operations::evaluate<PuiseuxFraction,T> >(vec.top(),operations::evaluate<PuiseuxFraction,T>(t,exp));
}
template <typename MatrixType, typename T> static
typename std::enable_if<fits_as_coefficient<T>::value && is_field_of_fractions<Exponent>::value,
const LazyMatrix1<const MatrixType&, operations::evaluate<PuiseuxFraction, typename algebraic_traits<T>::field_type> > >::type
evaluate(const GenericMatrix<MatrixType, PuiseuxFraction>& m, const T& t, const long exp=1)
{
Integer exp_lcm(exp);
for (typename Entire<ConcatRows<MatrixType> >::const_iterator e = entire(concat_rows(m.top())); !e.at_end(); ++e)
exp_lcm = lcm(denominators(numerator(*e).monomials_as_vector() | denominator(*e).monomials_as_vector()) | exp_lcm);
const double t_approx = std::pow(convert_to<double>(t),1.0/convert_to<double>(exp_lcm));
const typename algebraic_traits<T>::field_type base = exp_lcm == exp ? t : t_approx;
return LazyMatrix1<
const MatrixType&,
operations::evaluate<PuiseuxFraction, typename algebraic_traits<T>::field_type>
>(m.top(), operations::evaluate<PuiseuxFraction, typename algebraic_traits<T>::field_type>(base, long(exp_lcm)));
}
template <typename MatrixType, typename T> static
typename std::enable_if<fits_as_coefficient<T>::value && std::numeric_limits<Exponent>::is_integer,
const LazyMatrix1<const MatrixType&, operations::evaluate<PuiseuxFraction, T> > >::type
evaluate(const GenericMatrix<MatrixType, PuiseuxFraction>& m, const T& t, const long exp=1)
{
return LazyMatrix1<
const MatrixType&,
operations::evaluate<PuiseuxFraction,T>
>(m.top(),operations::evaluate<PuiseuxFraction,T>(t,exp));
}
template <typename VectorType> static
const LazyVector1<const VectorType&, operations::evaluate<PuiseuxFraction,double> >
evaluate_float(const GenericVector<VectorType,PuiseuxFraction>& vec, const double t)
{
return LazyVector1<const VectorType&, operations::evaluate<PuiseuxFraction,double> >(vec.top(),operations::evaluate<PuiseuxFraction,double>(t));
}
template <typename MatrixType> static
const LazyMatrix1<const MatrixType&, operations::evaluate<PuiseuxFraction,double> >
evaluate_float(const GenericMatrix<MatrixType,PuiseuxFraction>& vec, const double t)
{
return LazyMatrix1<const MatrixType&, operations::evaluate<PuiseuxFraction,double> >(vec.top(),operations::evaluate<PuiseuxFraction,double>(t));
}
template <typename Scalar,
typename=typename std::enable_if<can_initialize<Coefficient, Scalar>::value>::type>
explicit operator Scalar () const
{
if (denominator(*this).unit() &&
numerator(*this).deg() == 0 && numerator(*this).lower_deg() == 0)
return static_cast<Scalar>(numerator(*this).lc());
throw std::runtime_error("Conversion to scalar not possible.");
}
explicit operator TropicalNumber<MinMax, Exponent> () const
{
return val();
}
size_t get_hash() const noexcept { return rf.get_hash(); }
#if POLYMAKE_DEBUG
void dump() const __attribute__((used)) { rf.dump(); }
#endif
};
template <typename MinMax, typename Coefficient, typename Exponent>
inline
int sign(const PuiseuxFraction<MinMax, Coefficient, Exponent>& x)
{
return x.compare(zero_value<Coefficient>());
}
namespace operations {
template <typename OpRef, typename T>
struct evaluate {
typedef OpRef argument_type;
typedef typename algebraic_traits<T>::field_type result_type;
evaluate(const T& t, const long e=1) : val(t), exp(e) { }
result_type operator() (typename function_argument<OpRef>::const_type x) const
{
return x.evaluate_exp(val,exp);
}
private:
const T val;
const long exp;
};
template <typename OpRef>
struct evaluate<OpRef, double> {
typedef OpRef argument_type;
typedef double result_type;
evaluate(const double& t, const int e=1) : val(t), exp(e) { }
result_type operator() (typename function_argument<OpRef>::const_type x) const
{
return x.evaluate_float(std::pow(val,exp));
}
private:
const double val;
const int exp;
};
}
template <typename MinMax, typename Coefficient, typename Exponent>
struct algebraic_traits< PuiseuxFraction<MinMax, Coefficient, Exponent> > {
typedef PuiseuxFraction<MinMax,typename algebraic_traits<Coefficient>::field_type,Exponent> field_type;
};
template <typename MinMax, typename Coefficient, typename Exponent>
struct spec_object_traits< Serialized< PuiseuxFraction<MinMax, Coefficient, Exponent> > >
: spec_object_traits<is_composite> {
typedef PuiseuxFraction<MinMax, Coefficient, Exponent> masquerade_for;
typedef RationalFunction<Coefficient, Exponent> elements;
template <typename Me, typename Visitor>
static void visit_elements(Me& me, Visitor& v)
{
v << me.rf;
}
};
template <typename MinMax, typename Coefficient, typename Exponent>
struct choose_generic_object_traits< PuiseuxFraction<MinMax,Coefficient,Exponent>, false, false>
: spec_object_traits<PuiseuxFraction<MinMax,Coefficient,Exponent> > {
typedef PuiseuxFraction<MinMax, Coefficient, Exponent> persistent_type;
typedef void generic_type;
typedef is_scalar generic_tag;
static
bool is_zero(const persistent_type& p)
{
return pm::is_zero(p.rf);
}
static
bool is_one(const persistent_type& p)
{
return pm::is_one(p.rf);
}
static
const persistent_type& zero()
{
static const persistent_type x=persistent_type();
return x;
}
static
const persistent_type& one()
{
static const persistent_type x(1);
return x;
}
};
template <typename MinMax, typename Coefficient, typename Exponent>
struct hash_func<PuiseuxFraction<MinMax,Coefficient,Exponent>, is_scalar> {
size_t operator() (const PuiseuxFraction<MinMax,Coefficient,Exponent>& p) const noexcept
{
return p.get_hash();
}
};
namespace polynomial_impl {
template <typename MinMax, typename Coefficient, typename Exponent>
struct nesting_level< PuiseuxFraction<MinMax, Coefficient, Exponent> >
: int_constant<nesting_level<Coefficient>::value+1> {};
}
} // end namespace pm
namespace polymake {
using pm::PuiseuxFraction;
}
namespace std {
template <typename MinMax, typename Coefficient, typename Exponent>
void swap(pm::PuiseuxFraction<MinMax,Coefficient,Exponent>& x1, pm::PuiseuxFraction<MinMax,Coefficient,Exponent>& x2) { x1.swap(x2); }
template <typename MinMax, typename Coefficient, typename Exponent>
class numeric_limits<pm::PuiseuxFraction<MinMax,Coefficient,Exponent> > : public numeric_limits<Coefficient> {
public:
static const bool is_integer=false;
static pm::PuiseuxFraction<MinMax,Coefficient,Exponent> min() throw() { return pm::PuiseuxFraction<MinMax,Coefficient,Exponent>(numeric_limits<Coefficient>::min()); }
static pm::PuiseuxFraction<MinMax,Coefficient,Exponent> infinity() throw() { return pm::PuiseuxFraction<MinMax,Coefficient,Exponent>(numeric_limits<Coefficient>::infinity()); }
static pm::PuiseuxFraction<MinMax,Coefficient,Exponent> max() throw() { return pm::PuiseuxFraction<MinMax,Coefficient,Exponent>(numeric_limits<Coefficient>::max()); }
};
}
#endif // POLYMAKE_VALUATED_RATIONAL_FUNCTION_H
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