1 files changed, 65 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
index 00000000..13d2133f
--- /dev/null
+++ b/src/Persistence_representations/utilities/persistence_intervals/plot_histogram_of_intervals_lengths.cpp
@@ -0,0 +1,65 @@
+/*    This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
+ *    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
+ *    Author(s):       Pawel Dlotko
+ *
+ *    Copyright (C) 2016 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+#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 computes a histogram of barcode's length. A number of bins in the histogram is a "
+            << "parameter of this program. \n";
+  if ((argc != 3) && (argc != 4)) {
+    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. Set a negative number dominant intervals value "
+              << "If your file contains only birth-death pairs.\n"
+              << "The third parameter 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 dominant_interval_number = std::numeric_limits<unsigned>::max();
+  int nbr = atoi(argv[2]);
+  if (nbr >= 0) {
+    dominant_interval_number = static_cast<unsigned>(nbr);
+  }
+
+  int persistence_dimension = -1;
+  if (argc == 4) {
+    persistence_dimension = atoi(argv[3]);
+  }
+
+  Persistence_intervals p(argv[1], dominant_interval_number);
+  std::vector<std::pair<double, double> > dominant_intervals = p.dominant_intervals(persistence_dimension);
+  std::vector<size_t> histogram = p.histogram_of_lengths(10);
+
+  std::stringstream gnuplot_script;
+  gnuplot_script << argv[1] << "_GnuplotScript";
+  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;
+  out.close();
+
+  std::cout << "To visualize, install gnuplot and type the command: gnuplot -persist -e \"load \'"
+            << gnuplot_script.str().c_str() << "\'\"" << std::endl;
+  return 0;
+}