quadrature_grid_1d.c

一个用来实现偏微分方程中网格的计算库

// $Id: quadrature_grid_1D.C 2501 2007-11-20 02:33:29Z benkirk $

// The libMesh Finite Element Library.
// Copyright (C) 2002-2007  Benjamin S. Kirk, John W. Peterson
  
// This library 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 2.1 of the License, or (at your option) any later version.
  
// This library 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 this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA



// C++ includes

// Local includes
#include "quadrature_grid.h"
 


void QGrid::init_1D(const ElemType,
                    unsigned int)
{
  //----------------------------------------------------------------------
  // 1D quadrature rules

  // We ignore p - the grid rule is just for experimentation

  _points.resize(_order + 1);
  _weights.resize(_order + 1);
  for (int i = 0; i != _order + 1; ++i)
    {
      _points[i](0) = 2.0 * (double)i / (double)_order - 1.0;
      _weights[i] = 2.0 / (double)(_order + 1);
    }
  return;
}