basic example, infinity

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/bottleneck_integration@1797 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: 23432677e7f1628dda596e9ba31138fc5063a608

1 files changed, 77 insertions, 0 deletions

diff --git a/src/Bottleneck_distance/example/bottleneck_read_file_example.cpp b/src/Bottleneck_distance/example/bottleneck_read_file_example.cpp
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+++ b/src/Bottleneck_distance/example/bottleneck_read_file_example.cpp
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+/*    This file is part of the Gudhi Library. The Gudhi library
+ *    (Geometric Understanding in Higher Dimensions) is a generic C++
+ *    library for computational topology.
+ *
+ *    Authors:       Francois Godi, small modifications by Pawel Dlotko
+ *
+ *    Copyright (C) 2015  INRIA (France)
+ *
+ *    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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#define CGAL_HAS_THREADS
+
+#include <gudhi/Bottleneck.h>
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <string>
+
+std::vector< std::pair<double, double> > read_diagram_from_file( const char* filename )
+{
+    std::ifstream in;
+    in.open( filename );
+    std::vector< std::pair<double, double> > result;
+    if ( !in.is_open() )
+    {
+        std::cerr << "File : " << filename << " do not exist. The program will now terminate \n";
+        throw "File do not exist \n";
+    }
+
+    std::string line;
+    while (!in.eof())
+    {
+        getline(in,line);
+        if ( line.length() != 0 )
+        {
+            std::stringstream lineSS;
+            lineSS << line;
+            double beginn, endd;
+            lineSS >> beginn;
+            lineSS >> endd;
+            result.push_back( std::make_pair( beginn , endd ) );
+        }
+    }
+    in.close();
+    return result;
+}  //read_diagram_from_file
+
+int main( int argc , char** argv )
+{
+  if ( argc < 3 )
+  {
+      std::cout << "To run this program please provide as an input two files with persistence diagrams. Each file " <<
+          "should contain a birth-death pair per line. Third, optional parameter is an error bound on a bottleneck" <<
+          " distance (set by default to zero). The program will now terminate \n";
+  }
+  std::vector< std::pair< double , double > > diag1 = read_diagram_from_file( argv[1] );
+  std::vector< std::pair< double , double > > diag2 = read_diagram_from_file( argv[2] );
+  double tolerance = 0.;
+  if ( argc == 4 )
+  {
+      tolerance = atof( argv[3] );
+  }
+  double b = Gudhi::bottleneck_distance::compute(diag1, diag2, tolerance);
+  std::cout << "The distance between the diagrams is : " << b << ". The tolerance is : " << tolerance << std::endl;
+}