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LinConst.cc
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1996-09-28
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// LinConst.cc -*- C++ -*-
/*
Copyright (C) 1992, 1993, 1994, 1995 John W. Eaton
This file is part of Octave.
Octave 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.
Octave 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 Octave; see the file COPYING. If not, write to the Free
Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <iostream.h>
#include "LinConst.h"
#include "lo-error.h"
// error handling
void
LinConst::error (const char* msg)
{
(*current_liboctave_error_handler) ("fatal LinConst error: %s", msg);
}
LinConst::LinConst (const Matrix& a_eq, const Vector& b_eq,
const Matrix& a_ineq, const Vector& b_ineq)
{
// Need some checks here.
int nc_eq = b_eq.capacity ();
int nc_ineq = b_ineq.capacity ();
nb = nc_eq + nc_ineq;
lb.resize (nb);
ub.resize (nb);
lb.insert (b_eq, 0);
lb.insert (-b_ineq, nc_eq);
ub.insert (b_eq, 0);
ub.fill (DBL_MAX, nc_eq, nb-1);
int nx = a_eq.columns ();
A.resize (nb, nx);
A.insert (a_eq, 0, 0);
A.insert (a_ineq, nc_eq, 0);
}
LinConst&
LinConst::resize (int nc, int n)
{
nb = nc;
lb.resize (nb);
A.resize (nb, n);
ub.resize (nb);
return *this;
}
Matrix
LinConst::eq_constraint_matrix (void) const
{
int anr = A.rows ();
int anc = A.columns ();
Matrix retval (anr, anc);
int count = 0;
for (int i = 0; i < anr; i++)
{
if (lb.elem (i) == ub.elem (i))
{
retval.insert (A.extract (i, 0, i, anc-1), count, 0);
count++;
}
}
retval.resize (count, anc);
return retval;
}
Matrix
LinConst::ineq_constraint_matrix (void) const
{
int anr = A.rows ();
int anc = A.columns ();
Matrix retval (2*anr, anc);
int count = 0;
for (int i = 0; i < anr; i++)
{
if (lb.elem (i) != ub.elem (i))
{
Matrix tmp = A.extract (i, 0, i, anc-1);
retval.insert (tmp, count, 0);
count++;
if (ub.elem (i) < DBL_MAX)
{
retval.insert (-tmp, count, 0);
count++;
}
}
}
retval.resize (count, anc);
return retval;
}
Vector
LinConst::eq_constraint_vector (void) const
{
Vector retval (nb);
int count = 0;
for (int i = 0; i < nb; i++)
{
if (lb.elem (i) == ub.elem (i))
{
retval.elem (count) = lb.elem (i);
count++;
}
}
retval.resize (count);
return retval;
}
Vector
LinConst::ineq_constraint_vector (void) const
{
Vector retval (2*nb);
int count = 0;
for (int i = 0; i < nb; i++)
{
if (lb.elem (i) != ub.elem (i))
{
retval.elem (count) = -lb.elem (i);
count++;
if (ub.elem (i) < DBL_MAX)
{
retval.elem (count) = ub.elem (i);
count++;
}
}
}
retval.resize (count);
return retval;
}
ostream&
operator << (ostream& os, const LinConst& c)
{
for (int i = 0; i < c.size (); i++)
os << c.lower_bound (i) << " " << c.upper_bound (i) << "\n";
os << "\n";
os << c.constraint_matrix ();
return os;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; page-delimiter: "^/\\*" ***
;;; End: ***
*/