1 files changed, 80 insertions, 0 deletions
diff --git a/utilities/Bitmap_cubical_complex/cubical_complex_persistence.cpp b/utilities/Bitmap_cubical_complex/cubical_complex_persistence.cpp
new file mode 100644
index 00000000..9d1bc08c
--- /dev/null
+++ b/utilities/Bitmap_cubical_complex/cubical_complex_persistence.cpp
@@ -0,0 +1,80 @@
+/*    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) 2015  INRIA Saclay (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/Bitmap_cubical_complex.h>
+#include <gudhi/Persistent_cohomology.h>
+
+// standard stuff
+#include <iostream>
+#include <string>
+#include <vector>
+#include <cstddef>
+
+int main(int argc, char** argv) {
+  std::cout
+      << "This program computes persistent homology, by using bitmap_cubical_complex class, of cubical "
+      << "complexes provided in text files in Perseus style (the only numbered in the first line is a dimension D of a"
+      << "bitmap. In the lines I between 2 and D+1 there are numbers of top dimensional cells in the direction I. Let "
+      << "N denote product of the numbers in the lines between 2 and D. In the lines D+2 to D+2+N there are "
+      << "filtrations of top dimensional cells. We assume that the cells are in the lexicographical order. See "
+      << "CubicalOneSphere.txt or CubicalTwoSphere.txt for example.\n"
+      << std::endl;
+
+  if (argc != 2) {
+    std::cerr << "Wrong number of parameters. Please provide the name of a file with a Perseus style bitmap at "
+              << "the input. The program will now terminate.\n";
+    return 1;
+  }
+
+  typedef Gudhi::cubical_complex::Bitmap_cubical_complex_base<double> Bitmap_cubical_complex_base;
+  typedef Gudhi::cubical_complex::Bitmap_cubical_complex<Bitmap_cubical_complex_base> Bitmap_cubical_complex;
+  typedef Gudhi::persistent_cohomology::Field_Zp Field_Zp;
+  typedef Gudhi::persistent_cohomology::Persistent_cohomology<Bitmap_cubical_complex, Field_Zp> Persistent_cohomology;
+
+  Bitmap_cubical_complex b(argv[1]);
+
+  // Compute the persistence diagram of the complex
+  Persistent_cohomology pcoh(b);
+  int p = 11;
+  double min_persistence = 0;
+
+  pcoh.init_coefficients(p);  // initializes the coefficient field for homology
+  pcoh.compute_persistent_cohomology(min_persistence);
+
+  std::string output_file_name(argv[1]);
+  output_file_name += "_persistence";
+
+  std::size_t last_in_path = output_file_name.find_last_of("/\\");
+
+  if (last_in_path != std::string::npos) {
+    output_file_name = output_file_name.substr(last_in_path + 1);
+  }
+
+  std::ofstream out(output_file_name.c_str());
+  pcoh.output_diagram(out);
+  out.close();
+
+  std::cout << "Result in file: " << output_file_name << "\n";
+
+  return 0;
+}