1 files changed, 72 insertions, 0 deletions
diff --git a/src/Persistence_representations/utilities/persistence_intervals/plot_histogram_of_intervals_lengths.cpp b/src/Persistence_representations/utilities/persistence_intervals/plot_histogram_of_intervals_lengths.cpp
new file mode 100644
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--- /dev/null
+++ b/src/Persistence_representations/utilities/persistence_intervals/plot_histogram_of_intervals_lengths.cpp
@@ -0,0 +1,72 @@
+/*    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):       Pawel Dlotko
+ *
+ *    Copyright (C) 2016  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/>.
+ */
+
+#include <gudhi/reader_utils.h>
+#include <gudhi/Persistence_intervals.h>
+
+#include <iostream>
+#include <vector>
+#include <limits>
+#include <utility>
+
+using Persistence_intervals = Gudhi::Persistence_representations::Persistence_intervals;
+
+int main(int argc, char** argv) {
+  std::cout << "This program compute a histogram of barcode's length. A number of bins in the histogram is a parameter "
+               "of this program. \n";
+  if (argc != 3) {
+    std::cout << "To run this program, please provide the name of a file with persistence diagram and number of "
+                 "dominant intervals you would like to get \n";
+    std::cout << "The third parameter of a program is the dimension of the persistence that is to be used. If your "
+                 "file contains only birth-death pairs, you can skip this parameter\n";
+    return 1;
+  }
+  unsigned dimension = std::numeric_limits<unsigned>::max();
+  int dim = -1;
+  if (argc > 2) {
+    dim = atoi(argv[2]);
+  }
+  if (dim >= 0) {
+    dimension = (unsigned)dim;
+  }
+
+  Persistence_intervals p(argv[1], dimension);
+  std::vector<std::pair<double, double> > dominant_intervals = p.dominant_intervals(atoi(argv[2]));
+  std::vector<size_t> histogram = p.histogram_of_lengths(10);
+
+  std::stringstream gnuplot_script;
+  gnuplot_script << argv[1] << "_Gnuplot_script";
+  std::ofstream out;
+  out.open(gnuplot_script.str().c_str());
+
+  out << "set style data histogram" << std::endl;
+  out << "set style histogram cluster gap 1" << std::endl;
+  out << "set style fill solid border -1" << std::endl;
+  out << "plot '-' notitle" << std::endl;
+  for (size_t i = 0; i != histogram.size(); ++i) {
+    out << histogram[i] << std::endl;
+  }
+  out << std::endl;
+  std::cout << "To visualize, open gnuplot and type: load \'" << gnuplot_script.str().c_str() << "\'" << std::endl;
+  out.close();
+  return 0;
+}