/usr/include/rheolef/gauss_legendre_check.icc is in librheolef-dev 6.5-1+b1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | /// This file is part of Rheolef.
///
/// Copyright (C) 2000-2009 Pierre Saramito
///
/// Rheolef 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 of the License, or
/// (at your option) any later version.
///
/// Rheolef 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 Rheolef; if not, write to the Free Software
/// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
/// lexer for qmg mesh files
/// =========================================================================
#include "rheolef/compiler.h"
#include <iterator>
template <class Iterator1, class Iterator2, class Size>
typename std::iterator_traits<Iterator1>::value_type
gauss_legendre_check (Size R, Iterator1 zeta, Iterator2 omega, Size order) {
typedef typename std::iterator_traits<Iterator1>::value_type T;
T error = 0;
for (Size k = 0; k <= order; k++) {
T value = 0;
for (Size r = 0; r < R; r++) {
value += pow (zeta[r], T(k))*omega[r];
}
T exact = (k % 2 == 1) ? T(0) : 2/T(k+1);
error = std::max (error, fabs (exact - value));
}
typedef typename std::iterator_traits<Iterator1>::value_type T;
return error;
}
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