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/*
Copyright (C) 1996 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#if defined (__GNUG__)
#pragma implementation
#endif
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <iostream.h>
#include "FEGrid.h"
#include "lo-error.h"
// error handling
void
FEGrid::error (const char* msg) const
{
(*current_liboctave_error_handler) ("fatal FEGrid error: %s", msg);
}
void
FEGrid::nel_error (void) const
{
error ("number of elements less than 1");
}
// Constructors
FEGrid::FEGrid (int nel, double width)
{
if (nel < 1)
{
nel_error ();
return;
}
elem.resize (nel+1);
for (int i = 0; i <= nel; i++)
elem.elem (i) = i * width;
}
FEGrid::FEGrid (int nel, double left, double right)
{
if (nel < 1)
{
nel_error ();
return;
}
elem.resize (nel+1);
double width = (right - left) / (double) nel;
for (int i = 0; i <= nel; i++)
elem.elem (i) = i * width + left;
check_grid ();
}
int
FEGrid::element (double x) const
{
if (! in_bounds (x))
{
error ("value not within grid boundaries");
return -1;
}
int nel = elem.capacity () - 1;
for (int i = 1; i <= nel; i++)
{
if (x >= elem.elem (i-1) && x <= elem.elem (i))
return i;
}
return -1;
}
void
FEGrid::check_grid (void) const
{
int nel = elem.capacity () - 1;
if (nel < 1)
{
nel_error ();
return;
}
for (int i = 1; i <= nel; i++)
{
if (elem.elem (i-1) > elem.elem (i))
{
error ("element boundaries not in ascending order");
return;
}
if (elem.elem (i-1) == elem.elem (i))
{
error ("zero width element");
return;
}
}
}
ostream&
operator << (ostream& s, const FEGrid& g)
{
s << g.element_boundaries ();
return s;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
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