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//=====================================================
// File   :  blitz_interface.hh
// Author :  L. Plagne <laurent.plagne@edf.fr)>
// Copyright (C) EDF R&D,  lun sep 30 14:23:30 CEST 2002
// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
//=====================================================
//
// 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; either version 2
// of the License, or (at your option) any later version.
//
// 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.
//
#ifndef BLITZ_INTERFACE_HH
#define BLITZ_INTERFACE_HH

#include <blitz/blitz.h>
#include <blitz/array.h>
#include <blitz/vector-et.h>
#include <blitz/vecwhere.h>
#include <blitz/matrix.h>
#include <vector>

BZ_USING_NAMESPACE(blitz)

template<class real>
class blitz_interface{

public :

  typedef real real_type ;

  typedef std::vector<real>  stl_vector;
  typedef std::vector<stl_vector > stl_matrix;

  typedef blitz::Array<real, 2>  gene_matrix;
  typedef blitz::Array<real, 1>  gene_vector;
//   typedef blitz::Matrix<real, blitz::ColumnMajor>  gene_matrix;
//   typedef blitz::Vector<real> gene_vector;

  static inline std::string name() { return "blitz"; }

  static void free_matrix(gene_matrix & A, int N){}

  static void free_vector(gene_vector & B){}

  static inline void matrix_from_stl(gene_matrix & A, stl_matrix & A_stl){
    A.resize(A_stl[0].size(),A_stl.size());
    for (int j=0; j<A_stl.size() ; j++){
      for (int i=0; i<A_stl[j].size() ; i++){
        A(i,j)=A_stl[j][i];
      }
    }
  }

  static inline void vector_from_stl(gene_vector & B, stl_vector & B_stl){
    B.resize(B_stl.size());
    for (int i=0; i<B_stl.size() ; i++){
      B(i)=B_stl[i];
    }
  }

  static inline void vector_to_stl(gene_vector & B, stl_vector & B_stl){
    for (int i=0; i<B_stl.size() ; i++){
      B_stl[i]=B(i);
    }
  }

  static inline void matrix_to_stl(gene_matrix & A, stl_matrix & A_stl){
    int N=A_stl.size();
    for (int j=0;j<N;j++){
      A_stl[j].resize(N);
      for (int i=0;i<N;i++)
        A_stl[j][i] = A(i,j);
    }
  }

  static inline void matrix_matrix_product(const gene_matrix & A, const gene_matrix & B, gene_matrix & X, int N)
  {
    firstIndex i;
    secondIndex j;
    thirdIndex k;
    X = sum(A(i,k) * B(k,j), k);
  }

  static inline void ata_product(const gene_matrix & A, gene_matrix & X, int N)
  {
    firstIndex i;
    secondIndex j;
    thirdIndex k;
    X = sum(A(k,i) * A(k,j), k);
  }

  static inline void aat_product(const gene_matrix & A, gene_matrix & X, int N)
  {
    firstIndex i;
    secondIndex j;
    thirdIndex k;
    X = sum(A(i,k) * A(j,k), k);
  }

  static inline void matrix_vector_product(gene_matrix & A, gene_vector & B, gene_vector & X, int N)
  {
    firstIndex i;
    secondIndex j;
    X = sum(A(i,j)*B(j),j);
  }

  static inline void atv_product(gene_matrix & A, gene_vector & B, gene_vector & X, int N)
  {
    firstIndex i;
    secondIndex j;
    X = sum(A(j,i) * B(j),j);
  }

  static inline void axpy(const real coef, const gene_vector & X, gene_vector & Y, int N)
  {
    firstIndex i;
    Y = Y(i) + coef * X(i);
    //Y += coef * X;
  }

  static inline void copy_matrix(const gene_matrix & source, gene_matrix & cible, int N){
    cible = source;
    //cible.template operator=<gene_matrix>(source);
//     for (int i=0;i<N;i++){
//       for (int j=0;j<N;j++){
//         cible(i,j)=source(i,j);
//       }
//     }
  }

  static inline void copy_vector(const gene_vector & source, gene_vector & cible, int N){
    //cible.template operator=<gene_vector>(source);
    cible = source;
  }

};

#endif