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/* ReductionTestWithCPLEX.cpp -- Check reducibility of vectors using CPLEX
Copyright 2007 Matthias Koeppe
This file is part of LattE.
LattE is free software; you can redistribute it and/or modify it
under the terms of the version 2 of the GNU General Public License
as published by the Free Software Foundation.
LattE 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.
You should have received a copy of the GNU General Public License
along with LattE; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <fstream>
#include <iostream>
#include <cstdlib>
#include <cassert>
#include "ReductionTestWithCPLEX.h"
using namespace std;
static void
open_matrix_file(const string &filename, ifstream &file,
int &num, int &dim)
{
file.open(filename.c_str());
if (!file.good()) {
cerr << "Failed to open " << filename << endl;
exit(1);
}
file >> num >> dim;
if (!file.good()) {
cerr << "Parse error reading file " << filename << endl;
exit(1);
}
}
ReductionTestWithCPLEX::ReductionTestWithCPLEX(const ReductionTestFactory &data) :
verbose(data.verbose)
{
if (data.rays_filename.size() == 0) {
cerr << "--reduction=cplex requires the use of --reduction-rays-file=FILE" << endl;
exit(1);
}
string generators_filename = data.rays_filename;
int dim_generators;
ifstream generators_file;
open_matrix_file(generators_filename, generators_file, num_generators, dim_generators);
dim = dim_generators;
int status;
env = CPXopenCPLEX(&status);
if (status != 0) {
cerr << "Failed to obtain CPLEX environent." << endl;
abort();
}
lp = CPXcreateprob(env, &status, "repr");
if (status != 0) abort();
status = CPXnewrows(env, lp, dim, /*rhs:*/ NULL, /*sense:*/ NULL,
/*rngval:*/ NULL, /*rownames:*/ NULL);
if (status != 0) abort();
status = CPXnewcols(env, lp, num_generators, /*obj:*/ NULL,
/*lb:*/ NULL, /*ub:*/ NULL,
/*ctype:*/ NULL, /*colname:*/NULL);
if (status != 0) abort();
int i;
for (i = 0; i<num_generators; i++) {
status = CPXchgcoef(env, lp, -1, i, 1.0);
if (status != 0) abort();
int j;
for (j = 0; j<dim; j++) {
double x;
generators_file >> x;
status = CPXchgcoef(env, lp, j, i, x);
if (status != 0) abort();
}
if (!generators_file.good()) {
cerr << "Parse error reading generator file" << endl;
exit(1);
}
}
multipliers = new double[num_generators];
indices = new int[num_generators];
ctype = new char[num_generators];
{
int i;
for (i = 0; i<num_generators; i++) {
indices[i] = i;
ctype[i] = CPX_INTEGER;
}
}
}
ReductionTestWithCPLEX::~ReductionTestWithCPLEX()
{
int status;
status = CPXfreeprob(env, &lp);
if (status != 0) abort();
status = CPXcloseCPLEX(&env);
if (status != 0) abort();
}
bool
ReductionTestWithCPLEX::IsReducible(const vector<int> &v)
{
bool is_reducible;
int status;
int j;
for (j = 0; j<dim; j++) {
double x = v[j];
status = CPXchgcoef(env, lp, j, -1, x);
if (status != 0) abort();
}
status = CPXdualopt(env, lp);
if (status != 0) abort();
int lpstat = CPXgetstat(env, lp);
if (lpstat != CPX_STAT_OPTIMAL) {
cerr << "LP solution status code: " << lpstat << endl;
cout << "LP written out as repr.lp" << endl;
status = CPXwriteprob(env, lp, "repr.lp", "LP");
if (status != 0) abort();
exit(1);
}
else {
if (verbose) {
cout << "CPLEX says: Vector lies in cone." << endl
<< "Multipliers: ";
status = CPXgetx(env, lp, multipliers, 0, num_generators - 1);
if (status != 0) abort();
for (j = 0; j<num_generators; j++)
cout << multipliers[j] << " ";
cout << endl;
}
}
status = CPXchgprobtype(env, lp, CPXPROB_MILP);
if (status != 0) abort();
status = CPXchgctype(env, lp, num_generators, indices, ctype);
if (status != 0) abort();
status = CPXmipopt(env, lp);
if (status != 0) abort();
int mipstat = CPXgetstat(env, lp);
if (mipstat != CPXMIP_OPTIMAL) {
cerr << "MIP solution status code: " << mipstat << endl;
status = CPXwriteprob(env, lp, "repr-ip.lp", "LP");
if (status != 0) {
cerr << "Cannot write repr-ip.lp" << endl;
abort();
}
cout << "MIP written out as repr-ip.lp" << endl;
is_reducible = false;
}
else {
if (verbose) {
cout << "CPLEX says: Vector is generated over the nonnegative integers." << endl
<< "Multipliers: ";
status = CPXgetmipx(env, lp, multipliers, 0, num_generators - 1);
if (status != 0) abort();
for (j = 0; j<num_generators; j++)
cout << multipliers[j] << " ";
cout << endl;
}
is_reducible = true;
}
status = CPXchgprobtype(env, lp, CPXPROB_LP);
if (status != 0) abort();
return is_reducible;
}
int ReductionTestWithCPLEX::GetDimension()
{
return dim;
}
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