/usr/include/polymake/polytope/lpch_dispatcher.h is in libpolymake-dev-common 3.2r2-3.
This file is owned by root:root, with mode 0o644.
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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_POLYTOPE_LPCH_DISPATCHER_H
#define POLYMAKE_POLYTOPE_LPCH_DISPATCHER_H
#include "polymake/client.h"
#include "polymake/Matrix.h"
#include "polymake/SparseMatrix.h"
#include "polymake/Vector.h"
#include "polymake/internal/linalg_exceptions.h"
#include "polymake/internal/sparse.h"
namespace polymake { namespace polytope {
class not_pointed : public linalg_error {
protected:
int lin_dim;
public:
not_pointed(int dim_arg)
: linalg_error("polyhedron not pointed"),
lin_dim(dim_arg) {}
int lineality_dim() const { return lin_dim; }
};
class unbounded : public linalg_error {
public:
unbounded() : linalg_error("unbounded linear program") {}
};
class baddual : public linalg_error {
public:
baddual() : linalg_error("problem is either inconsistent or unbounded") {}
baddual(const std::string& what) : linalg_error(what) {}
};
class dually_infeasible : public linalg_error {
public:
dually_infeasible() : linalg_error("dual linear program infeasible") {}
};
template <typename Solver>
void ch_primal(perl::Object& p, Solver& solver)
{
typedef typename Solver::coord_type coord_type;
Matrix<coord_type> Points=p.give("RAYS | INPUT_RAYS"),
Lineality=p.lookup("LINEALITY_SPACE | INPUT_LINEALITY");
const int d = std::max(Points.cols(),Lineality.cols());
const bool isCone = !p.isa("Polytope");
if (Points.cols() && Points.cols() != d ||
Lineality.cols() && Lineality.cols() != d) {
throw std::runtime_error("ch_primal - dimension mismatch for Points or Lineality");
}
if (!Points.cols())
Points.resize(0,d);
if (!Lineality.cols())
Lineality.resize(0,d);
if (isCone) {
Points = zero_vector<coord_type>()|Points;
Lineality = zero_vector<coord_type>()|Lineality;
}
typename Solver::matrix_pair F=solver.enumerate_facets(Points, Lineality, isCone, false);
if (isCone) {
p.take("FACETS") << F.first.minor(All, sequence(1, F.first.cols()-1));
p.take("LINEAR_SPAN") << F.second.minor(All, sequence(1, F.second.cols()-1));
} else {
p.take("FACETS") << F.first;
p.take("LINEAR_SPAN") << F.second;
}
}
// only lrs
template <typename Solver>
void count_facets(perl::Object& p, Solver& solver)
{
typedef typename Solver::coord_type coord_type;
Matrix<coord_type> Points=p.give("RAYS | INPUT_RAYS"),
Lineality=p.lookup("LINEALITY_SPACE | INPUT_LINEALITY");
const int d = std::max(Points.cols(),Lineality.cols());
const bool isCone = !p.isa("Polytope");
if (Points.cols() && Points.cols() != d ||
Lineality.cols() && Lineality.cols() != d) {
throw std::runtime_error("count_facets - dimension mismatch for Points or Lineality");
}
if (!Points.cols())
Points.resize(0,d);
if (!Lineality.cols())
Lineality.resize(0,d);
if (isCone) {
Points = zero_vector<coord_type>()|Points;
Lineality = zero_vector<coord_type>()|Lineality;
}
p.take("N_FACETS") << solver.count_facets(Points,Lineality,isCone);
}
template <typename Solver>
void ch_dual(perl::Object& p, Solver& solver)
{
typedef typename Solver::coord_type coord_type;
Matrix<coord_type> H=p.give("FACETS | INEQUALITIES"),
EQ=p.lookup("LINEAR_SPAN | EQUATIONS");
const int d = std::max(H.cols(),EQ.cols());
// TODO: pass this as an input flag, providing overridable rules for Cone and Polytope
const bool isCone = !p.isa("Polytope");
// * we handle the case of polytopes with empty exterior description somewhat special:
// empty facet matrix implies that the polytope must be empty!
// empty inequalities cannot occur due to the far face initial rule
// * this also covers the case when the ambient dimension is empty for polytopes
// * for cones an empty exterior description describes the whole space and is handled
// correctly in the interfaces
if (isCone || H.rows() > 0 || EQ.rows() > 0) {
if (H.cols() && H.cols() != d ||
EQ.cols() && EQ.cols() != d) {
throw std::runtime_error("ch_dual - dimension mismatch for Inequalities or Equations");
}
if (!H.cols())
H.resize(0,d);
if (!EQ.cols())
EQ.resize(0,d);
if (isCone) {
H = zero_vector<coord_type>()|H;
EQ = zero_vector<coord_type>()|EQ;
}
try {
typename Solver::matrix_pair VL=solver.enumerate_vertices(H, EQ, isCone, true);
if (isCone) {
p.take("RAYS") << VL.first.minor(All, sequence(1, VL.first.cols()-1));
p.take("LINEALITY_SPACE") << VL.second.minor(All, sequence(1, VL.second.cols()-1));
} else {
p.take("RAYS") << VL.first;
p.take("LINEALITY_SPACE") << VL.second;
}
p.take("POINTED") << (VL.second.rows()==0);
p.take("LINEALITY_DIM") << VL.second.rows();
return;
}
catch (const infeasible&) { }
}
p.take("RAYS") << Matrix<coord_type>(0, d);
p.take("LINEALITY_SPACE") << Matrix<coord_type>(0, d);
p.take("LINEALITY_DIM") << 0;
p.take("POINTED") << true;
}
// only lrs
// FIXME maybe we should separate cone/polytope in these functions
template <typename Solver>
void count_vertices(perl::Object& p, Solver& solver, bool only_bounded=false)
{
typedef typename Solver::coord_type coord_type;
Matrix<coord_type> H=p.give("FACETS | INEQUALITIES"),
EQ=p.lookup("LINEAR_SPAN | EQUATIONS");
const int d = std::max(H.cols(),EQ.cols());
const bool isCone = !p.isa("Polytope");
// * we handle the case of polytopes with empty exterior description somewhat special:
// empty facet matrix implies that the polytope must be empty!
// empty inequalities cannot occur due to the far face initial rule
// * this also covers the case when the ambient dimension is empty for polytopes
// * for cones an empty exterior description describes the whole space and is handled
// correctly in the interfaces
if (isCone || H.rows() > 0 || EQ.rows() > 0) {
if ( isCone && only_bounded )
throw std::runtime_error("a cone has no bounded vertices");
if (H.cols() && H.cols() != d ||
EQ.cols() && EQ.cols() != d) {
throw std::runtime_error("count_vertices - dimension mismatch for Inequalities or Equations");
}
if (!H.cols())
H.resize(0,d);
if (!EQ.cols())
EQ.resize(0,d);
try {
if (isCone) {
H = zero_vector<coord_type>()|H;
EQ = zero_vector<coord_type>()|EQ;
}
typename Solver::vertex_count count=solver.count_vertices(H,EQ,only_bounded);
if ( isCone ) {
// lrs counts the origin
// we have to substract this in our representation
p.take("N_RAYS") << count.verts.first-1;
} else {
if (!only_bounded) p.take("N_VERTICES") << count.verts.first;
p.take("N_BOUNDED_VERTICES") << count.verts.second;
}
p.take("POINTED") << (count.lin==0);
p.take("LINEALITY_DIM") << count.lin;
return;
}
catch (const infeasible&) { }
}
p.take("POINTED") << 1;
p.take("LINEALITY_DIM") << 0;
if (!only_bounded)
p.take("N_RAYS") << 0;
if (!isCone)
p.take("N_BOUNDED_VERTICES") << 0;
}
} }
#endif // POLYMAKE_POLYTOPE_LPCH_DISPATCHER_H
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