//===========================================================================
// SINTEF LSMG library - version 1.1
//
// Copyright (C) 2000-2005 SINTEF ICT, Applied Mathematics, Norway.
//
// This program 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 version 2 of the License. 
//
// This program 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 this program; if not, write to the Free Software            
// Foundation, Inc.,                                                      
// 59 Temple Place - Suite 330,                                           
// Boston, MA  02111-1307, USA.                                           
//
// Contact information: e-mail: tor.dokken@sintef.no                      
// SINTEF ICT, Department of Applied Mathematics,                         
// P.O. Box 124 Blindern,                                                 
// 0314 Oslo, Norway.                                                     
//
// Other licenses are also available for this software, notably licenses
// for:
// - Building commercial software.                                        
// - Building software whose source code you wish to keep private.        
//===========================================================================
#ifndef _SMOOTHMATRIX_H
#define _SMOOTHMATRIX_H

/**
Note that the smooth matrix does not occupy much memory. Thus
it can be reinitialized many times during relaxion cycles.
*/
class SmoothMatrix {
  int K_; // order
  int n1_, n2_; // ??? NOTE: This is not the matrix dimension, but
  double alphaU_; // "alpha" , "dilation" factor (1/scale)
  double alphaU3_; // = alphaU_^3
  double alphaV_;
  double alphaV3_; // = alphaV_^3
  static double innerProduct_[3][4]; // [der][trans]

  static double innerProductQd0_[3][3]; // [offset-1][trans]
  static double innerProductQd1_[3][3]; // [offset-1][trans]
  static double innerProductQd2_[3][3]; // [offset-1][trans]
  int cutOff(int ij, int rs, int mn) const;

public:
  SmoothMatrix(int m, int n, double dU, double dV);
  ~SmoothMatrix(){}

  // indices runs from 0
  double operator()(int i, int j, int r, int s) const;
  double norm_l2() const;
};

#endif
