/usr/include/dolfin/quadrature/GaussianQuadrature.h is in libdolfin1.0-dev 1.0.0-1.
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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 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | // Copyright (C) 2003-2005 Anders Logg
//
// This file is part of DOLFIN.
//
// DOLFIN is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// DOLFIN 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with DOLFIN. If not, see <http://www.gnu.org/licenses/>.
//
// First added: 2003-06-03
// Last changed: 2009-08-10
#ifndef __GAUSSIAN_QUADRATURE_H
#define __GAUSSIAN_QUADRATURE_H
#include "Quadrature.h"
namespace dolfin {
/// Gaussian-type quadrature rule on the double line,
/// including Gauss, Radau, and Lobatto quadrature.
///
/// Points and weights are computed to be exact within a tolerance
/// of DOLFIN_EPS. Comparing with known exact values for n <= 3 shows
/// that we obtain full precision (16 digits, error less than 2e-16).
class GaussianQuadrature : public Quadrature
{
public:
GaussianQuadrature(unsigned int n);
protected:
// Compute points and weights
void init();
// Compute quadrature points
virtual void compute_points() = 0;
// Compute quadrature weights
void compute_weights();
// Check that quadrature is exact for given degree q
bool check(unsigned int q) const;
};
}
#endif
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