//
//              LAPACK++ 1.1 Linear Algebra Package 1.1
//               University of Tennessee, Knoxvilee, TN.
//            Oak Ridge National Laboratory, Oak Ridge, TN.
//        Authors: J. J. Dongarra, E. Greaser, R. Pozo, D. Walker
//                 (C) 1992-1996 All Rights Reserved
//
//                             NOTICE
//
// Permission to use, copy, modify, and distribute this software and
// its documentation for any purpose and without fee is hereby granted
// provided that the above copyright notice appear in all copies and
// that both the copyright notice and this permission notice appear in
// supporting documentation.
//
// Neither the Institutions (University of Tennessee, and Oak Ridge National
// Laboratory) nor the Authors make any representations about the suitability 
// of this software for any purpose.  This software is provided ``as is'' 
// without express or implied warranty.
//
// LAPACK++ was funded in part by the U.S. Department of Energy, the
// National Science Foundation and the State of Tennessee.

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include "arch.h"
#include "lafnames.h"
#include LA_EXCEPTION_H
#include LA_SYMM_TRIDIAG_MAT_DOUBLE_H


DLLIMPORT double LaSymmTridiagMatDouble::outofbounds_ = 0; // set outofbounds_. 

DLLIMPORT int LaSymmTridiagMatDouble::debug_ = 0; // set debug to 0 initially.

DLLIMPORT int* LaSymmTridiagMatDouble::info_= new int;  // turn off info print flag.

double& LaSymmTridiagMatDouble::operator()(int i,int j)
{
        int tmp = i-j;
        switch (tmp){
        case 0:   // main
            if (i>d_.size()-1)
                return outofbounds_;
            else
                return d_(i);
        case 1:   // lower
        case -1:  // upper
            if (i>dl_.size()-1)
                return outofbounds_;
            else
                return dl_(i);
        default:
            return outofbounds_;
        }
}

 double LaSymmTridiagMatDouble::operator()(int i,int j) const
{
        int tmp = i-j;
        switch (tmp){
        case 0:   // main
            if (i>d_.size()-1)
                return outofbounds_;
            else
                return d_(i);
        case 1:   // lower
        case -1:  // upper
            if (i>dl_.size()-1)
                return outofbounds_;
            else
                return dl_(i);
        default:
            return outofbounds_;
        }
}
 
 LaVectorDouble LaSymmTridiagMatDouble::diag(int k)
{

    LaVectorDouble tmp;

        switch (k){
        case 0:   // main
            tmp.ref(d_);
            break;
        case -1:  // lower
        case 1:   // upper
            tmp.ref(dl_);
            break;
        default:
            std::cerr <<"Unrecognized integer representation of diagonal\n";assert(0);
        }
                    
    return tmp;
}

 LaVectorDouble LaSymmTridiagMatDouble::diag(int k) const
{

    LaVectorDouble tmp;

        switch (k){
        case 0:   // main
            tmp.ref(d_);
            break;
        case -1:  // lower
        case 1:   // upper
            tmp.ref(dl_);
            break;
        default:
            std::cerr <<"Unrecognized integer representation of diagonal\n";assert(0);
        }
                    
    return tmp;
}


#define OUTPUT_MATRIX
#ifdef OUTPUT_MATRIX

std::ostream& operator<<(std::ostream& s, const LaSymmTridiagMatDouble& td)

{
  if (*(td.info_))     // print out only matrix info, not actual values
  {
      *(td.info_) = 0; // reset the flag
      s << "maindiag: (" << td.d_.size() << ") " ;
      s <<" #ref: "<< td.d_.ref_count() << std::endl;
      s << "subdiag: (" << td.dl_.size() << ") " ;
      s <<" #ref: "<< td.dl_.ref_count() << std::endl;
  }
  else
  {
    int tmp, N = td.size_, n = N-1;

    for (int i=0;i<N;i++)
    {
        for (int j=0;j<N;j++)
        {   
            tmp = i-j;
            switch (tmp)
            {
                case 0:   // main
                    s << td.d_(i) << ' ';
                    break;
                case 1:  // lower
                case -1:   // upper
                    if (i < n)
                        s << td.dl_(i) << ' ';
                    break;
                default:
                    s << "  ";
            }
        }
        s << std::endl;
    }
    s << std::endl;
  } 
  return s;
}

#else // output individual vectors

std::ostream& operator<<(std::ostream& s, const LaSymmTridiagMatDouble& td)

{
  if (*(td.info_))     // print out only matrix info, not actual values
  {
      *(td.info_) = 0; // reset the flag
      s << "maindiag: (" << td.d_.size() << ") " ;
      s <<" #ref: "<< td.d_.ref_count() << std::endl;
      s << "subdiag: (" << td.dl_.size() << ") " ;
      s <<" #ref: "<< td.dl_.ref_count() << std::endl;
  }
  else
    {
        s << td.dl_;
        s << td.d_ ;
        s << td.dl_;
    }
  
  return s;
}

#endif // OUTPUT_MATRIX