ExampleSymmetricMatrix3x3.cpp

Example for a symmetric matric

Author

woelk 11/2007 (c) www.vision-n.de

/* This file is part of the BIAS library (Basic ImageAlgorithmS).

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   Multimediale Systeme der Informationsverarbeitung
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   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
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   along with BIAS; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA*/

/**
   @example ExampleSymmetricMatrix3x3.cpp
   @relates SymmetricMatrix3x3
   @brief Example for a symmetric matric
   @ingroup g_examples
   @author woelk 11/2007 (c) www.vision-n.de
*/

#include <Base/Math/SymmetricMatrix3x3.hh>
#include <Base/Math/Matrix3x3.hh>

#include <fstream>

using namespace BIAS;
using namespace std;

int main(int argc, char *argv[])
{
  SymmetricMatrix3x3<float> sm, sm2;
  Matrix3x3<float> src, dst;
  //   cout << "sizeof(float) = "<<sizeof(float)<<endl
  //        << "sizeof(double) = "<<sizeof(double)<<endl
  //        << "sizeof(SymmetricMatrix3x3<float>) = "
  //        << sizeof(SymmetricMatrix3x3<float>)<<endl
  //        << "sizeof(SymmetricMatrix3x3<double>) = "
  //        << sizeof(SymmetricMatrix3x3<double>)<<endl;

  for (int r=0; r<3; r++){
    for (int c=r; c<3; c++){
      src[r][c] = src[c][r] = (float)(r*3+c);
    }
  }
  cout << "src: "<<src<<endl;


  sm = src;
  cout << "symmetric matrix: \n"<< sm << endl;

  sm.GetMatrix(dst);
  cout << "dst: "<<dst<<endl;
  
  for (int r=0; r<3; r++){
    for (int c=0; c<3; c++){
      cout << sm(r,c) << "\t";
    } 
    cout << endl;
  }

  sm(2,1) = 7.0f;
  
  cout << "\nafter changing one element: \n" << sm << endl;

  cout << endl << "writing: \n";
  for (int r=0; r<3; r++){
    for (int c=0; c<3; c++){
      cout << sm(r,c) << "\t";
    } 
    cout << endl;
  }

  string fname = "foo.mat";
  ofstream of(fname.c_str());
  if (sm.Write(of)!=0){
    BIASERR("error writing symmetric matrix");
    return -1;
  }
  of.close();

  ifstream is(fname.c_str());
  if (sm2.Read(is)!=0){
    BIASERR("error reading Symmetric matrix");
    return -1;
  }
  is.close();
  
  cout << "read: \n"<<sm2<<endl;

  return 0;
}