3 files changed, 76 insertions, 0 deletions
diff --git a/src/Bottleneck_distance/utilities/CMakeLists.txt b/src/Bottleneck_distance/utilities/CMakeLists.txt
new file mode 100644
index 00000000..063b6ae3
--- /dev/null
+++ b/src/Bottleneck_distance/utilities/CMakeLists.txt
@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 2.6)
+project(Bottleneck_distance_utilities)
+
+if (NOT CGAL_WITH_EIGEN3_VERSION VERSION_LESS 4.8.1)
+  add_executable (bottleneck_read_file bottleneck_read_file.cpp)
+  if (TBB_FOUND)
+    target_link_libraries(bottleneck_read_file ${TBB_LIBRARIES})
+  endif(TBB_FOUND)
+
+  add_test(NAME Bottleneck_distance_utilities_Bottleneck_read_file
+      COMMAND $<TARGET_FILE:bottleneck_read_file>
+      "${CMAKE_SOURCE_DIR}/data/persistence_diagram/first.pers" "${CMAKE_SOURCE_DIR}/data/persistence_diagram/second.pers")
+
+  install(TARGETS bottleneck_read_file DESTINATION bin)
+
+endif (NOT CGAL_WITH_EIGEN3_VERSION VERSION_LESS 4.8.1)
diff --git a/src/Bottleneck_distance/utilities/README b/src/Bottleneck_distance/utilities/README
new file mode 100644
index 00000000..d9fdd252
--- /dev/null
+++ b/src/Bottleneck_distance/utilities/README
@@ -0,0 +1,10 @@
+# Bottleneck_distance #
+
+## `bottleneck_read_file_example` ##
+This program computes the Bottleneck distance between two persistence diagram files.
+
+Usage:
+`bottleneck_read_file_example <file_1.pers> <file_2.pers> [<tolerance>]`
+where
+`<file_1.pers>` and `<file_2.pers>` must be in the format described [here](http://gudhi.gforge.inria.fr/doc/latest/fileformats.html#FileFormatsPers).
+`<tolerance>` is an error bound on the bottleneck distance (set by default to the smallest positive double value).
diff --git a/src/Bottleneck_distance/utilities/bottleneck_read_file.cpp b/src/Bottleneck_distance/utilities/bottleneck_read_file.cpp
new file mode 100644
index 00000000..9dd52b31
--- /dev/null
+++ b/src/Bottleneck_distance/utilities/bottleneck_read_file.cpp
@@ -0,0 +1,50 @@
+/*    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
+ *
+ *    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/Bottleneck.h>
+#include <gudhi/reader_utils.h>
+#include <iostream>
+#include <vector>
+#include <utility>  // for pair
+#include <string>
+#include <limits>  // for numeric_limits
+
+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 the bottleneck" <<
+        " distance (set by default to the smallest positive double value). If you set the error bound to 0, be" <<
+        " aware this version is exact but expensive. The program will now terminate \n";
+    return -1;
+  }
+  std::vector<std::pair<double, double>> diag1 = Gudhi::read_persistence_intervals_in_dimension(argv[1]);
+  std::vector<std::pair<double, double>> diag2 = Gudhi::read_persistence_intervals_in_dimension(argv[2]);
+
+  double tolerance = std::numeric_limits<double>::min();
+  if (argc == 4) {
+    tolerance = atof(argv[3]);
+  }
+  double b = Gudhi::persistence_diagram::bottleneck_distance(diag1, diag2, tolerance);
+  std::cout << "The distance between the diagrams is : " << b << ". The tolerance is : " << tolerance << std::endl;
+
+  return 0;
+}