Merge branch 'master' into weighted_alpha_complex_dD

21 files changed, 59 insertions, 107 deletions

diff --git a/src/Bitmap_cubical_complex/example/CMakeLists.txt b/src/Bitmap_cubical_complex/example/CMakeLists.txt
index dc659f2d..0ff290ef 100644
--- a/src/Bitmap_cubical_complex/example/CMakeLists.txt
+++ b/src/Bitmap_cubical_complex/example/CMakeLists.txt
@@ -6,5 +6,3 @@ if (TBB_FOUND)
 endif()
 add_test(NAME Bitmap_cubical_complex_example_random COMMAND $<TARGET_FILE:Random_bitmap_cubical_complex>
     "2" "100" "100")
-
-install(TARGETS Random_bitmap_cubical_complex DESTINATION bin)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index cc230531..79ec42c1 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -50,6 +50,14 @@ include_directories(include)
 
 # Include module CMake subdirectories
 # GUDHI_SUB_DIRECTORIES is managed in CMAKE_MODULE_PATH/GUDHI_modules.cmake
+if (WITH_GUDHI_PYTHON)
+  # specific for cython module
+  add_subdirectory(${GUDHI_PYTHON_PATH})
+else()
+  message("++ Python module will not be compiled because WITH_GUDHI_PYTHON is set to OFF")
+  set(GUDHI_MISSING_MODULES ${GUDHI_MISSING_MODULES} "python")
+endif()
+
 foreach(GUDHI_MODULE ${GUDHI_MODULES})
   foreach(GUDHI_SUB_DIRECTORY ${GUDHI_SUB_DIRECTORIES})
     if(EXISTS ${CMAKE_SOURCE_DIR}/${GUDHI_SUB_DIRECTORY}/${GUDHI_MODULE}/CMakeLists.txt)
@@ -60,14 +68,6 @@ endforeach()
 
 add_subdirectory(GudhUI)
 
-if (WITH_GUDHI_PYTHON)
-  # specific for cython module
-  add_subdirectory(${GUDHI_PYTHON_PATH})
-else()
-  message("++ Python module will not be compiled because WITH_GUDHI_PYTHON is set to OFF")
-  set(GUDHI_MISSING_MODULES ${GUDHI_MISSING_MODULES} "python")
-endif()
-
 message("++ GUDHI_MODULES list is:\"${GUDHI_MODULES}\"")
 message("++ GUDHI_MISSING_MODULES list is:\"${GUDHI_MISSING_MODULES}\"")
 
diff --git a/src/Nerve_GIC/example/CMakeLists.txt b/src/Nerve_GIC/example/CMakeLists.txt
index 1667472f..4b0f4677 100644
--- a/src/Nerve_GIC/example/CMakeLists.txt
+++ b/src/Nerve_GIC/example/CMakeLists.txt
@@ -22,7 +22,4 @@ if (NOT CGAL_VERSION VERSION_LESS 4.11.0)
       "${CMAKE_CURRENT_BINARY_DIR}/lucky_cat.off"
       "${CMAKE_CURRENT_BINARY_DIR}/lucky_cat_PCA1")
 
-  install(TARGETS CoordGIC DESTINATION bin)
-  install(TARGETS FuncGIC DESTINATION bin)
-
 endif (NOT CGAL_VERSION VERSION_LESS 4.11.0)
diff --git a/src/Persistence_representations/example/CMakeLists.txt b/src/Persistence_representations/example/CMakeLists.txt
index a7c6ef39..997f85dc 100644
--- a/src/Persistence_representations/example/CMakeLists.txt
+++ b/src/Persistence_representations/example/CMakeLists.txt
@@ -3,30 +3,24 @@ project(Persistence_representations_example)
 add_executable ( Persistence_representations_example_landscape_on_grid persistence_landscape_on_grid.cpp )
 add_test(NAME Persistence_representations_example_landscape_on_grid
     COMMAND $<TARGET_FILE:Persistence_representations_example_landscape_on_grid>)
-install(TARGETS Persistence_representations_example_landscape_on_grid DESTINATION bin)
 
 add_executable ( Persistence_representations_example_landscape persistence_landscape.cpp )
 add_test(NAME Persistence_representations_example_landscape
     COMMAND $<TARGET_FILE:Persistence_representations_example_landscape>)
-install(TARGETS Persistence_representations_example_landscape DESTINATION bin)
 
 add_executable ( Persistence_representations_example_intervals persistence_intervals.cpp )
 add_test(NAME Persistence_representations_example_intervals
     COMMAND $<TARGET_FILE:Persistence_representations_example_intervals>
     "${CMAKE_SOURCE_DIR}/data/persistence_diagram/first.pers")
-install(TARGETS Persistence_representations_example_intervals DESTINATION bin)
 
 add_executable ( Persistence_representations_example_vectors persistence_vectors.cpp )
 add_test(NAME Persistence_representations_example_vectors
     COMMAND $<TARGET_FILE:Persistence_representations_example_vectors>)
-install(TARGETS Persistence_representations_example_vectors DESTINATION bin)
 
 add_executable ( Persistence_representations_example_heat_maps persistence_heat_maps.cpp )
 add_test(NAME Persistence_representations_example_heat_maps
     COMMAND $<TARGET_FILE:Persistence_representations_example_heat_maps>)
-install(TARGETS Persistence_representations_example_heat_maps DESTINATION bin)
 
 add_executable ( Sliced_Wasserstein sliced_wasserstein.cpp )
 add_test(NAME Sliced_Wasserstein
     COMMAND $<TARGET_FILE:Sliced_Wasserstein>)
-install(TARGETS Sliced_Wasserstein DESTINATION bin)
diff --git a/src/Persistent_cohomology/example/CMakeLists.txt b/src/Persistent_cohomology/example/CMakeLists.txt
index d6a92ed6..c68c6524 100644
--- a/src/Persistent_cohomology/example/CMakeLists.txt
+++ b/src/Persistent_cohomology/example/CMakeLists.txt
@@ -5,7 +5,6 @@ if (TBB_FOUND)
   target_link_libraries(plain_homology ${TBB_LIBRARIES})
 endif()
 add_test(NAME Persistent_cohomology_example_plain_homology COMMAND $<TARGET_FILE:plain_homology>)
-install(TARGETS plain_homology DESTINATION bin)
 
 add_executable(persistence_from_simple_simplex_tree persistence_from_simple_simplex_tree.cpp)
 if (TBB_FOUND)
@@ -13,7 +12,6 @@ if (TBB_FOUND)
 endif()
 add_test(NAME Persistent_cohomology_example_from_simple_simplex_tree COMMAND $<TARGET_FILE:persistence_from_simple_simplex_tree>
     "1" "0")
-install(TARGETS persistence_from_simple_simplex_tree DESTINATION bin)
 
 if(TARGET Boost::program_options)
   add_executable(rips_persistence_step_by_step rips_persistence_step_by_step.cpp)
@@ -23,7 +21,6 @@ if(TARGET Boost::program_options)
   endif()
   add_test(NAME Persistent_cohomology_example_from_rips_step_by_step_on_tore_3D COMMAND $<TARGET_FILE:rips_persistence_step_by_step>
       "${CMAKE_SOURCE_DIR}/data/points/tore3D_1307.off" "-r" "0.25" "-m" "0.5" "-d" "3" "-p" "3")
-  install(TARGETS rips_persistence_step_by_step DESTINATION bin)
 endif()
 
 if(TARGET Boost::program_options)
@@ -34,7 +31,6 @@ if(TARGET Boost::program_options)
   endif()
   add_test(NAME Persistent_cohomology_example_via_boundary_matrix COMMAND $<TARGET_FILE:rips_persistence_via_boundary_matrix>
       "${CMAKE_SOURCE_DIR}/data/points/Kl.off" "-r" "0.16" "-d" "3" "-p" "3" "-m" "100")
-  install(TARGETS rips_persistence_via_boundary_matrix DESTINATION bin)
 endif()
 
 if(TARGET Boost::program_options)
@@ -47,7 +43,6 @@ if(TARGET Boost::program_options)
       "${CMAKE_SOURCE_DIR}/data/filtered_simplicial_complex/bunny_5000_complex.fsc" "-p" "2" "-m" "0")
   add_test(NAME Persistent_cohomology_example_from_file_3_3_100 COMMAND $<TARGET_FILE:persistence_from_file>
       "${CMAKE_SOURCE_DIR}/data/filtered_simplicial_complex/bunny_5000_complex.fsc" "-p" "3" "-m" "100")
-  install(TARGETS persistence_from_file DESTINATION bin)
 endif()
 
 if(GMP_FOUND)
@@ -61,7 +56,6 @@ if(GMP_FOUND)
       endif(TBB_FOUND)
       add_test(NAME Persistent_cohomology_example_multifield_2_71 COMMAND $<TARGET_FILE:rips_multifield_persistence>
           "${CMAKE_SOURCE_DIR}/data/points/tore3D_1307.off" "-r" "0.25" "-m" "0.5" "-d" "3" "-p" "2" "-q" "71")
-      install(TARGETS rips_multifield_persistence DESTINATION bin)
     endif()
   endif(GMPXX_FOUND)
 endif(GMP_FOUND)
@@ -73,5 +67,4 @@ if (NOT CGAL_WITH_EIGEN3_VERSION VERSION_LESS 4.11.0)
     target_link_libraries(custom_persistence_sort ${TBB_LIBRARIES})
   endif(TBB_FOUND)
   add_test(NAME Persistent_cohomology_example_custom_persistence_sort COMMAND $<TARGET_FILE:custom_persistence_sort>)
-  install(TARGETS custom_persistence_sort DESTINATION bin)
 endif (NOT CGAL_WITH_EIGEN3_VERSION VERSION_LESS 4.11.0)
diff --git a/src/Rips_complex/example/CMakeLists.txt b/src/Rips_complex/example/CMakeLists.txt
index 244a93ec..206f4c11 100644
--- a/src/Rips_complex/example/CMakeLists.txt
+++ b/src/Rips_complex/example/CMakeLists.txt
@@ -72,8 +72,3 @@ if (DIFF_PATH)
 
 endif()
 
-install(TARGETS Rips_complex_example_from_off DESTINATION bin)
-install(TARGETS Rips_complex_example_one_skeleton_from_points DESTINATION bin)
-install(TARGETS Rips_complex_example_one_skeleton_from_distance_matrix DESTINATION bin)
-install(TARGETS Rips_complex_example_from_csv_distance_matrix DESTINATION bin)
-install(TARGETS Rips_complex_example_one_skeleton_rips_from_correlation_matrix DESTINATION bin)
diff --git a/src/Skeleton_blocker/example/CMakeLists.txt b/src/Skeleton_blocker/example/CMakeLists.txt
index 0e5d2f11..456612df 100644
--- a/src/Skeleton_blocker/example/CMakeLists.txt
+++ b/src/Skeleton_blocker/example/CMakeLists.txt
@@ -7,7 +7,3 @@ add_executable(Skeleton_blocker_example_link Skeleton_blocker_link.cpp)
 add_test(NAME Skeleton_blocker_example_from_simplices COMMAND $<TARGET_FILE:Skeleton_blocker_example_from_simplices>)
 add_test(NAME Skeleton_blocker_example_iteration COMMAND $<TARGET_FILE:Skeleton_blocker_example_iteration>)
 add_test(NAME Skeleton_blocker_example_link COMMAND $<TARGET_FILE:Skeleton_blocker_example_link>)
-
-install(TARGETS Skeleton_blocker_example_from_simplices DESTINATION bin)
-install(TARGETS Skeleton_blocker_example_iteration DESTINATION bin)
-install(TARGETS Skeleton_blocker_example_link DESTINATION bin)
diff --git a/src/Spatial_searching/example/CMakeLists.txt b/src/Spatial_searching/example/CMakeLists.txt
index eeb3e85f..308afa00 100644
--- a/src/Spatial_searching/example/CMakeLists.txt
+++ b/src/Spatial_searching/example/CMakeLists.txt
@@ -5,5 +5,4 @@ if(NOT CGAL_WITH_EIGEN3_VERSION VERSION_LESS 4.11.0)
   target_link_libraries(Spatial_searching_example_spatial_searching ${CGAL_LIBRARY})
   add_test(NAME Spatial_searching_example_spatial_searching
       COMMAND $<TARGET_FILE:Spatial_searching_example_spatial_searching>)
-  install(TARGETS Spatial_searching_example_spatial_searching DESTINATION bin)
 endif(NOT CGAL_WITH_EIGEN3_VERSION VERSION_LESS 4.11.0)
diff --git a/src/Subsampling/example/CMakeLists.txt b/src/Subsampling/example/CMakeLists.txt
index 28aab103..dfac055c 100644
--- a/src/Subsampling/example/CMakeLists.txt
+++ b/src/Subsampling/example/CMakeLists.txt
@@ -14,9 +14,4 @@ if(NOT CGAL_WITH_EIGEN3_VERSION VERSION_LESS 4.11.0)
   add_test(NAME Subsampling_example_sparsify_point_set
       COMMAND $<TARGET_FILE:Subsampling_example_sparsify_point_set>)
 
-  install(TARGETS Subsampling_example_pick_n_random_points DESTINATION bin)
-  install(TARGETS Subsampling_example_choose_n_farthest_points DESTINATION bin)
-  install(TARGETS Subsampling_example_custom_kernel DESTINATION bin)
-  install(TARGETS Subsampling_example_sparsify_point_set DESTINATION bin)
-
 endif(NOT CGAL_WITH_EIGEN3_VERSION VERSION_LESS 4.11.0)
diff --git a/src/Tangential_complex/example/CMakeLists.txt b/src/Tangential_complex/example/CMakeLists.txt
index cb1486a4..b66b5f39 100644
--- a/src/Tangential_complex/example/CMakeLists.txt
+++ b/src/Tangential_complex/example/CMakeLists.txt
@@ -15,6 +15,4 @@ if(NOT CGAL_WITH_EIGEN3_VERSION VERSION_LESS 4.11.0)
   add_test(NAME Tangential_complex_example_with_perturb
       COMMAND $<TARGET_FILE:Tangential_complex_example_with_perturb>)
 
-  install(TARGETS Tangential_complex_example_basic DESTINATION bin)
-  install(TARGETS Tangential_complex_example_with_perturb DESTINATION bin)
 endif(NOT CGAL_WITH_EIGEN3_VERSION VERSION_LESS 4.11.0)
diff --git a/src/Witness_complex/example/CMakeLists.txt b/src/Witness_complex/example/CMakeLists.txt
index 2659798e..5e9736ed 100644
--- a/src/Witness_complex/example/CMakeLists.txt
+++ b/src/Witness_complex/example/CMakeLists.txt
@@ -7,8 +7,6 @@ endif()
 add_test(NAME Witness_complex_example_nearest_landmark_table
     COMMAND $<TARGET_FILE:Witness_complex_example_nearest_landmark_table>)
 
-install(TARGETS Witness_complex_example_nearest_landmark_table DESTINATION bin)
-
 # CGAL and Eigen3 are required for Euclidean version of Witness
 if(NOT CGAL_WITH_EIGEN3_VERSION VERSION_LESS 4.11.0)
   add_executable( Witness_complex_example_off example_witness_complex_off.cpp )
@@ -33,10 +31,5 @@ if(NOT CGAL_WITH_EIGEN3_VERSION VERSION_LESS 4.11.0)
   add_test(NAME Witness_complex_example_strong_off_test_torus
       COMMAND $<TARGET_FILE:Witness_complex_example_strong_off>
       "${CMAKE_SOURCE_DIR}/data/points/tore3D_1307.off" "20" "1.0" "3")
-      
-  install(TARGETS Witness_complex_example_off DESTINATION bin)
-  install(TARGETS Witness_complex_example_sphere DESTINATION bin)
-  install(TARGETS Witness_complex_example_strong_off DESTINATION bin)
-
 
 endif(NOT CGAL_WITH_EIGEN3_VERSION VERSION_LESS 4.11.0)
diff --git a/src/python/CMakeLists.txt b/src/python/CMakeLists.txt
index c09996fe..56b6876c 100644
--- a/src/python/CMakeLists.txt
+++ b/src/python/CMakeLists.txt
@@ -345,29 +345,27 @@ if(PYTHONINTERP_FOUND)
                COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
                ${PYTHON_EXECUTABLE} "${CMAKE_CURRENT_SOURCE_DIR}/example/alpha_rips_persistence_bottleneck_distance.py"
                -f ${CMAKE_SOURCE_DIR}/data/points/tore3D_300.off -t 0.15 -d 3)
-      if(MATPLOTLIB_FOUND AND NUMPY_FOUND)
-        # Tangential
-        add_test(NAME tangential_complex_plain_homology_from_off_file_example_py_test
-                 WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-                 COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
-                 ${PYTHON_EXECUTABLE} "${CMAKE_CURRENT_SOURCE_DIR}/example/tangential_complex_plain_homology_from_off_file_example.py"
-                 --no-diagram -i 2 -f ${CMAKE_SOURCE_DIR}/data/points/tore3D_300.off)
-
-        add_gudhi_py_test(test_tangential_complex)
-
-        # Witness complex AND Subsampling
-        add_test(NAME euclidean_strong_witness_complex_diagram_persistence_from_off_file_example_py_test
-                 WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-                 COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
-                 ${PYTHON_EXECUTABLE} "${CMAKE_CURRENT_SOURCE_DIR}/example/euclidean_strong_witness_complex_diagram_persistence_from_off_file_example.py"
-                 --no-diagram -f ${CMAKE_SOURCE_DIR}/data/points/tore3D_300.off -a 1.0 -n 20 -d 2)
-
-        add_test(NAME euclidean_witness_complex_diagram_persistence_from_off_file_example_py_test
-                 WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-                 COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
-                 ${PYTHON_EXECUTABLE} "${CMAKE_CURRENT_SOURCE_DIR}/example/euclidean_witness_complex_diagram_persistence_from_off_file_example.py"
-                 --no-diagram -f ${CMAKE_SOURCE_DIR}/data/points/tore3D_300.off -a 1.0 -n 20 -d 2)
-      endif()
+      # Tangential
+      add_test(NAME tangential_complex_plain_homology_from_off_file_example_py_test
+               WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+               COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
+               ${PYTHON_EXECUTABLE} "${CMAKE_CURRENT_SOURCE_DIR}/example/tangential_complex_plain_homology_from_off_file_example.py"
+               --no-diagram -i 2 -f ${CMAKE_SOURCE_DIR}/data/points/tore3D_300.off)
+
+      add_gudhi_py_test(test_tangential_complex)
+
+      # Witness complex
+      add_test(NAME euclidean_strong_witness_complex_diagram_persistence_from_off_file_example_py_test
+               WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+               COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
+               ${PYTHON_EXECUTABLE} "${CMAKE_CURRENT_SOURCE_DIR}/example/euclidean_strong_witness_complex_diagram_persistence_from_off_file_example.py"
+               --no-diagram -f ${CMAKE_SOURCE_DIR}/data/points/tore3D_300.off -a 1.0 -n 20 -d 2)
+
+      add_test(NAME euclidean_witness_complex_diagram_persistence_from_off_file_example_py_test
+               WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+               COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
+               ${PYTHON_EXECUTABLE} "${CMAKE_CURRENT_SOURCE_DIR}/example/euclidean_witness_complex_diagram_persistence_from_off_file_example.py"
+               --no-diagram -f ${CMAKE_SOURCE_DIR}/data/points/tore3D_300.off -a 1.0 -n 20 -d 2)
 
       # Subsampling
       add_gudhi_py_test(test_subsampling)
@@ -422,13 +420,11 @@ if(PYTHONINTERP_FOUND)
                WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
                COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
                ${PYTHON_EXECUTABLE} "${CMAKE_CURRENT_SOURCE_DIR}/example/alpha_complex_from_points_example.py")
-      if(MATPLOTLIB_FOUND AND NUMPY_FOUND)
-        add_test(NAME alpha_complex_diagram_persistence_from_off_file_example_py_test
-               WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-               COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
-               ${PYTHON_EXECUTABLE} "${CMAKE_CURRENT_SOURCE_DIR}/example/alpha_complex_diagram_persistence_from_off_file_example.py"
-               --no-diagram -f ${CMAKE_SOURCE_DIR}/data/points/tore3D_300.off -a 0.6)
-      endif()
+      add_test(NAME alpha_complex_diagram_persistence_from_off_file_example_py_test
+             WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+             COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
+             ${PYTHON_EXECUTABLE} "${CMAKE_CURRENT_SOURCE_DIR}/example/alpha_complex_diagram_persistence_from_off_file_example.py"
+             --no-diagram -f ${CMAKE_SOURCE_DIR}/data/points/tore3D_300.off -a 0.6)
       add_gudhi_py_test(test_alpha_complex)
     endif (NOT CGAL_WITH_EIGEN3_VERSION VERSION_LESS 4.11.0)
 
@@ -445,30 +441,26 @@ if(PYTHONINTERP_FOUND)
              ${PYTHON_EXECUTABLE} "${CMAKE_CURRENT_SOURCE_DIR}/example/periodic_cubical_complex_barcode_persistence_from_perseus_file_example.py"
              --no-barcode -f ${CMAKE_SOURCE_DIR}/data/bitmap/CubicalTwoSphere.txt)
 
-    if(NUMPY_FOUND)
-      add_test(NAME random_cubical_complex_persistence_example_py_test
-               WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-               COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
-               ${PYTHON_EXECUTABLE} "${CMAKE_CURRENT_SOURCE_DIR}/example/random_cubical_complex_persistence_example.py"
-               10 10 10)
-    endif()
+    add_test(NAME random_cubical_complex_persistence_example_py_test
+             WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+             COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
+             ${PYTHON_EXECUTABLE} "${CMAKE_CURRENT_SOURCE_DIR}/example/random_cubical_complex_persistence_example.py"
+             10 10 10)
 
     add_gudhi_py_test(test_cubical_complex)
 
     # Rips
-    if(MATPLOTLIB_FOUND AND NUMPY_FOUND)
-      add_test(NAME rips_complex_diagram_persistence_from_distance_matrix_file_example_py_test
-               WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-               COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
-               ${PYTHON_EXECUTABLE} "${CMAKE_CURRENT_SOURCE_DIR}/example/rips_complex_diagram_persistence_from_distance_matrix_file_example.py"
-               --no-diagram -f ${CMAKE_SOURCE_DIR}/data/distance_matrix/lower_triangular_distance_matrix.csv -e 12.0 -d 3)
+    add_test(NAME rips_complex_diagram_persistence_from_distance_matrix_file_example_py_test
+             WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+             COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
+             ${PYTHON_EXECUTABLE} "${CMAKE_CURRENT_SOURCE_DIR}/example/rips_complex_diagram_persistence_from_distance_matrix_file_example.py"
+             --no-diagram -f ${CMAKE_SOURCE_DIR}/data/distance_matrix/lower_triangular_distance_matrix.csv -e 12.0 -d 3)
 
-      add_test(NAME rips_complex_diagram_persistence_from_off_file_example_py_test
-               WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-               COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
-               ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/example/rips_complex_diagram_persistence_from_off_file_example.py
-               --no-diagram -f ${CMAKE_SOURCE_DIR}/data/points/tore3D_300.off  -e 0.25 -d 3)
-    endif()
+    add_test(NAME rips_complex_diagram_persistence_from_off_file_example_py_test
+             WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+             COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
+             ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/example/rips_complex_diagram_persistence_from_off_file_example.py
+             --no-diagram -f ${CMAKE_SOURCE_DIR}/data/points/tore3D_300.off  -e 0.25 -d 3)
 
     add_test(NAME rips_complex_from_points_example_py_test
              WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
diff --git a/src/python/example/alpha_complex_diagram_persistence_from_off_file_example.py b/src/python/example/alpha_complex_diagram_persistence_from_off_file_example.py
index 727af4fa..1e0273b3 100755
--- a/src/python/example/alpha_complex_diagram_persistence_from_off_file_example.py
+++ b/src/python/example/alpha_complex_diagram_persistence_from_off_file_example.py
@@ -3,7 +3,6 @@
 import argparse
 import errno
 import os
-import matplotlib.pyplot as plot
 import gudhi
 
 """ This file is part of the Gudhi Library - https://gudhi.inria.fr/ -
@@ -65,6 +64,7 @@ with open(args.file, "r") as f:
         print(simplex_tree.betti_numbers())
 
         if args.no_diagram == False:
+            import matplotlib.pyplot as plot
             gudhi.plot_persistence_diagram(diag, band=args.band)
             plot.show()
     else:
diff --git a/src/python/example/euclidean_strong_witness_complex_diagram_persistence_from_off_file_example.py b/src/python/example/euclidean_strong_witness_complex_diagram_persistence_from_off_file_example.py
index e1e572df..4e97cfe3 100755
--- a/src/python/example/euclidean_strong_witness_complex_diagram_persistence_from_off_file_example.py
+++ b/src/python/example/euclidean_strong_witness_complex_diagram_persistence_from_off_file_example.py
@@ -3,7 +3,6 @@
 import argparse
 import errno
 import os
-import matplotlib.pyplot as plot
 import gudhi
 
 """ This file is part of the Gudhi Library - https://gudhi.inria.fr/ -
@@ -82,6 +81,7 @@ with open(args.file, "r") as f:
         print(simplex_tree.betti_numbers())
 
         if args.no_diagram == False:
+            import matplotlib.pyplot as plot
             gudhi.plot_persistence_diagram(diag, band=args.band)
             plot.show()
     else:
diff --git a/src/python/example/euclidean_witness_complex_diagram_persistence_from_off_file_example.py b/src/python/example/euclidean_witness_complex_diagram_persistence_from_off_file_example.py
index 58cb2bb5..29076c74 100755
--- a/src/python/example/euclidean_witness_complex_diagram_persistence_from_off_file_example.py
+++ b/src/python/example/euclidean_witness_complex_diagram_persistence_from_off_file_example.py
@@ -3,7 +3,6 @@
 import argparse
 import errno
 import os
-import matplotlib.pyplot as plot
 import gudhi
 
 """ This file is part of the Gudhi Library - https://gudhi.inria.fr/ -
@@ -79,6 +78,7 @@ with open(args.file, "r") as f:
         print(simplex_tree.betti_numbers())
 
         if args.no_diagram == False:
+            import matplotlib.pyplot as plot
             gudhi.plot_persistence_diagram(diag, band=args.band)
             plot.show()
     else:
diff --git a/src/python/example/periodic_cubical_complex_barcode_persistence_from_perseus_file_example.py b/src/python/example/periodic_cubical_complex_barcode_persistence_from_perseus_file_example.py
index 499171df..ee3290c6 100755
--- a/src/python/example/periodic_cubical_complex_barcode_persistence_from_perseus_file_example.py
+++ b/src/python/example/periodic_cubical_complex_barcode_persistence_from_perseus_file_example.py
@@ -1,7 +1,6 @@
 #!/usr/bin/env python
 
 import argparse
-import matplotlib.pyplot as plot
 import errno
 import os
 import gudhi
@@ -75,6 +74,7 @@ if is_file_perseus(args.file):
     print("betti_numbers()=")
     print(periodic_cubical_complex.betti_numbers())
     if args.no_barcode == False:
+        import matplotlib.pyplot as plot
         gudhi.plot_persistence_barcode(diag)
         plot.show()
 else:
diff --git a/src/python/example/rips_complex_diagram_persistence_from_correlation_matrix_file_example.py b/src/python/example/rips_complex_diagram_persistence_from_correlation_matrix_file_example.py
index 1acb187c..ea2eb7e1 100755
--- a/src/python/example/rips_complex_diagram_persistence_from_correlation_matrix_file_example.py
+++ b/src/python/example/rips_complex_diagram_persistence_from_correlation_matrix_file_example.py
@@ -2,7 +2,6 @@
 
 import sys
 import argparse
-import matplotlib.pyplot as plot
 import gudhi
 
 """ This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
@@ -84,5 +83,6 @@ invert_diag = [
 ]
 
 if args.no_diagram == False:
+    import matplotlib.pyplot as plot
     gudhi.plot_persistence_diagram(invert_diag, band=args.band)
     plot.show()
diff --git a/src/python/example/rips_complex_diagram_persistence_from_distance_matrix_file_example.py b/src/python/example/rips_complex_diagram_persistence_from_distance_matrix_file_example.py
index 79ccca96..236d085d 100755
--- a/src/python/example/rips_complex_diagram_persistence_from_distance_matrix_file_example.py
+++ b/src/python/example/rips_complex_diagram_persistence_from_distance_matrix_file_example.py
@@ -1,7 +1,6 @@
 #!/usr/bin/env python
 
 import argparse
-import matplotlib.pyplot as plot
 import gudhi
 
 """ This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
@@ -60,5 +59,6 @@ print("betti_numbers()=")
 print(simplex_tree.betti_numbers())
 
 if args.no_diagram == False:
+    import matplotlib.pyplot as plot
     gudhi.plot_persistence_diagram(diag, band=args.band)
     plot.show()
diff --git a/src/python/example/rips_complex_diagram_persistence_from_off_file_example.py b/src/python/example/rips_complex_diagram_persistence_from_off_file_example.py
index 6f992508..e80233a9 100755
--- a/src/python/example/rips_complex_diagram_persistence_from_off_file_example.py
+++ b/src/python/example/rips_complex_diagram_persistence_from_off_file_example.py
@@ -3,7 +3,6 @@
 import argparse
 import errno
 import os
-import matplotlib.pyplot as plot
 import gudhi
 
 """ This file is part of the Gudhi Library - https://gudhi.inria.fr/ -
@@ -70,6 +69,7 @@ with open(args.file, "r") as f:
         print(simplex_tree.betti_numbers())
 
         if args.no_diagram == False:
+            import matplotlib.pyplot as plot
             gudhi.plot_persistence_diagram(diag, band=args.band)
             plot.show()
     else:
diff --git a/src/python/example/tangential_complex_plain_homology_from_off_file_example.py b/src/python/example/tangential_complex_plain_homology_from_off_file_example.py
index 85bade4a..a4b4e9f5 100755
--- a/src/python/example/tangential_complex_plain_homology_from_off_file_example.py
+++ b/src/python/example/tangential_complex_plain_homology_from_off_file_example.py
@@ -3,7 +3,6 @@
 import argparse
 import errno
 import os
-import matplotlib.pyplot as plot
 import gudhi
 
 """ This file is part of the Gudhi Library - https://gudhi.inria.fr/ -
@@ -62,6 +61,7 @@ with open(args.file, "r") as f:
         print(st.betti_numbers())
 
         if args.no_diagram == False:
+            import matplotlib.pyplot as plot
             gudhi.plot_persistence_diagram(diag, band=args.band)
             plot.show()
     else:
diff --git a/src/python/gudhi/simplex_tree.pyx b/src/python/gudhi/simplex_tree.pyx
index c671da56..813dc5c2 100644
--- a/src/python/gudhi/simplex_tree.pyx
+++ b/src/python/gudhi/simplex_tree.pyx
@@ -287,6 +287,8 @@ cdef class SimplexTree:
 
     def get_boundaries(self, simplex):
         """This function returns a generator with the boundaries of a given N-simplex.
+        If you do not need the filtration values, the boundary can also be obtained as
+        :code:`itertools.combinations(simplex,len(simplex)-1)`.
 
         :param simplex: The N-simplex, represented by a list of vertex.
         :type simplex: list of int.