Added witness_complex_from_file

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/witness@510 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: 22b61b82bae5fa75545c1eff22619426d5b8b469

1 files changed, 89 insertions, 0 deletions

diff --git a/src/Witness_complex/example/witness_complex_from_file.cpp b/src/Witness_complex/example/witness_complex_from_file.cpp
new file mode 100644
index 00000000..a0e192f7
--- /dev/null
+++ b/src/Witness_complex/example/witness_complex_from_file.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.
+ *
+ *    Author(s):       Vincent Rouvreau
+ *
+ *    Copyright (C) 2014  INRIA Sophia Antipolis-Méditerranée (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/>.
+ */
+
+#include <iostream>
+#include <fstream>
+#include <ctime>
+//#include "gudhi/graph_simplicial_complex.h"
+#include "gudhi/Witness_complex1.h"
+
+
+using namespace Gudhi;
+
+typedef std::vector< Vertex_handle > typeVectorVertex;
+typedef std::vector< std::vector <double> > Point_Vector;
+//typedef std::pair<typeVectorVertex, Filtration_value> typeSimplex;
+//typedef std::pair< Simplex_tree<>::Simplex_handle, bool > typePairSimplexBool;
+
+
+/**
+ * \brief Customized version of read_points
+ * which takes into account a possible nbP first line
+ *
+ */
+inline void
+read_points_cust ( std::string file_name , std::vector< std::vector< double > > & points)
+{  
+  std::ifstream in_file (file_name.c_str(),std::ios::in);
+  if(!in_file.is_open())
+    {
+      std::cerr << "Unable to open file " << file_name << std::endl;
+      return;
+    }
+  std::string line;
+  double x;
+  while( getline ( in_file , line ) )
+    {
+      std::vector< double > point;
+      std::istringstream iss( line );
+      while(iss >> x) { point.push_back(x); }
+      if (point.size() != 1)
+        points.push_back(point);
+    }
+  in_file.close();
+}
+
+int main (int argc, char * const argv[])
+{
+    if (argc != 3)
+      {
+          std::cerr << "Usage: " << argv[0]
+    << " path_to_point_file nbL \n";
+    return 0;
+  }
+  std::string file_name   = argv[1];
+  int nbL       = atoi(argv[2]);
+  
+  clock_t start, end;
+  //Construct the Simplex Tree
+  Witness_complex<> witnessComplex;
+ 
+  std::cout << "Let the carnage begin!\n";
+  start = clock();
+  Point_Vector point_vector;
+  read_points_cust(file_name, point_vector);
+  witnessComplex.witness_complex_from_file(point_vector, nbL);
+  end = clock();
+  std::cout << "Howdy world! The process took "
+       << (double)(end-start)/CLOCKS_PER_SEC << " s. \n";
+
+}