From e02efc78ac5e55512f145690391b0b794b139739 Mon Sep 17 00:00:00 2001
From: skachano <skachano@636b058d-ea47-450e-bf9e-a15bfbe3eedb>
Date: Fri, 17 Nov 2017 13:01:02 +0000
Subject: Added the commented choose_n_farthest_points everywhere

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/wit_doc_corrections@2909 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: 9f7a325facf798748c4c08e3815fbbd3d4075b78
---
 .../example/example_strong_witness_complex_off.cpp                | 8 +++++---
 .../example/example_strong_witness_persistence.cpp                | 6 ++++--
 src/Witness_complex/example/example_witness_complex_off.cpp       | 6 ++++--
 .../example/example_witness_complex_persistence.cpp               | 6 ++++--
 src/Witness_complex/example/example_witness_complex_sphere.cpp    | 4 +++-
 5 files changed, 20 insertions(+), 10 deletions(-)

(limited to 'src/Witness_complex/example')

diff --git a/src/Witness_complex/example/example_strong_witness_complex_off.cpp b/src/Witness_complex/example/example_strong_witness_complex_off.cpp
index 0ee9ee90..bc069654 100644
--- a/src/Witness_complex/example/example_strong_witness_complex_off.cpp
+++ b/src/Witness_complex/example/example_strong_witness_complex_off.cpp
@@ -23,6 +23,7 @@
 #include <gudhi/Simplex_tree.h>
 #include <gudhi/Euclidean_strong_witness_complex.h>
 #include <gudhi/pick_n_random_points.h>
+#include <gudhi/choose_n_farthest_points.h>
 #include <gudhi/Points_off_io.h>
 
 #include <CGAL/Epick_d.h>
@@ -63,9 +64,10 @@ int main(int argc, char * const argv[]) {
   std::cout << "Successfully read " << point_vector.size() << " points.\n";
   std::cout << "Ambient dimension is " << point_vector[0].dimension() << ".\n";
 
-  // Choose landmarks
-  Gudhi::subsampling::pick_n_random_points(point_vector, nbL, std::back_inserter(landmarks));
-
+  // Choose landmarks (decomment one of the following two lines)
+  // Gudhi::subsampling::pick_n_random_points(point_vector, nbL, std::back_inserter(landmarks));
+  Gudhi::subsampling::choose_n_farthest_points(K(), point_vector, nbL, Gudhi::subsampling::random_starting_point, std::back_inserter(landmarks));
+  
   // Compute witness complex
   start = clock();
   Witness_complex witness_complex(landmarks,
diff --git a/src/Witness_complex/example/example_strong_witness_persistence.cpp b/src/Witness_complex/example/example_strong_witness_persistence.cpp
index 1f0c5a42..e3e0c1ee 100644
--- a/src/Witness_complex/example/example_strong_witness_persistence.cpp
+++ b/src/Witness_complex/example/example_strong_witness_persistence.cpp
@@ -25,6 +25,7 @@
 #include <gudhi/Persistent_cohomology.h>
 #include <gudhi/Points_off_io.h>
 #include <gudhi/pick_n_random_points.h>
+#include <gudhi/choose_n_farthest_points.h>
 
 #include <boost/program_options.hpp>
 
@@ -76,8 +77,9 @@ int main(int argc, char * argv[]) {
   std::cout << "Successfully read " << witnesses.size() << " points.\n";
   std::cout << "Ambient dimension is " << witnesses[0].dimension() << ".\n";
 
-  // Choose landmarks from witnesses (one can also use Gudhi::subsampling::choose_n_farthest_points)
-  Gudhi::subsampling::pick_n_random_points(witnesses, nbL, std::back_inserter(landmarks));
+  // Choose landmarks (decomment one of the following two lines)
+  // Gudhi::subsampling::pick_n_random_points(point_vector, nbL, std::back_inserter(landmarks));
+  Gudhi::subsampling::choose_n_farthest_points(K(), witnesses, nbL, Gudhi::subsampling::random_starting_point, std::back_inserter(landmarks));
 
   // Compute witness complex
   Strong_witness_complex strong_witness_complex(landmarks,
diff --git a/src/Witness_complex/example/example_witness_complex_off.cpp b/src/Witness_complex/example/example_witness_complex_off.cpp
index b36dac0d..be11c955 100644
--- a/src/Witness_complex/example/example_witness_complex_off.cpp
+++ b/src/Witness_complex/example/example_witness_complex_off.cpp
@@ -4,6 +4,7 @@
 #include <gudhi/Simplex_tree.h>
 #include <gudhi/Euclidean_witness_complex.h>
 #include <gudhi/pick_n_random_points.h>
+#include <gudhi/choose_n_farthest_points.h>
 #include <gudhi/Points_off_io.h>
 
 #include <CGAL/Epick_d.h>
@@ -44,8 +45,9 @@ int main(int argc, char * const argv[]) {
   std::cout << "Successfully read " << point_vector.size() << " points.\n";
   std::cout << "Ambient dimension is " << point_vector[0].dimension() << ".\n";
 
-  // Choose landmarks
-  Gudhi::subsampling::pick_n_random_points(point_vector, nbL, std::back_inserter(landmarks));
+  // Choose landmarks (decomment one of the following two lines)
+  // Gudhi::subsampling::pick_n_random_points(point_vector, nbL, std::back_inserter(landmarks));
+  Gudhi::subsampling::choose_n_farthest_points(K(), point_vector, nbL, Gudhi::subsampling::random_starting_point, std::back_inserter(landmarks));
 
   // Compute witness complex
   start = clock();
diff --git a/src/Witness_complex/example/example_witness_complex_persistence.cpp b/src/Witness_complex/example/example_witness_complex_persistence.cpp
index a1146922..a63b0837 100644
--- a/src/Witness_complex/example/example_witness_complex_persistence.cpp
+++ b/src/Witness_complex/example/example_witness_complex_persistence.cpp
@@ -25,6 +25,7 @@
 #include <gudhi/Persistent_cohomology.h>
 #include <gudhi/Points_off_io.h>
 #include <gudhi/pick_n_random_points.h>
+#include <gudhi/choose_n_farthest_points.h>
 
 #include <boost/program_options.hpp>
 
@@ -76,8 +77,9 @@ int main(int argc, char * argv[]) {
   std::cout << "Successfully read " << witnesses.size() << " points.\n";
   std::cout << "Ambient dimension is " << witnesses[0].dimension() << ".\n";
 
-  // Choose landmarks from witnesses
-  Gudhi::subsampling::pick_n_random_points(witnesses, nbL, std::back_inserter(landmarks));
+  // Choose landmarks (decomment one of the following two lines)
+  // Gudhi::subsampling::pick_n_random_points(point_vector, nbL, std::back_inserter(landmarks));
+  Gudhi::subsampling::choose_n_farthest_points(K(), witnesses, nbL, Gudhi::subsampling::random_starting_point, std::back_inserter(landmarks));
 
   // Compute witness complex
   Witness_complex witness_complex(landmarks,
diff --git a/src/Witness_complex/example/example_witness_complex_sphere.cpp b/src/Witness_complex/example/example_witness_complex_sphere.cpp
index 124fd99b..a66da3f9 100644
--- a/src/Witness_complex/example/example_witness_complex_sphere.cpp
+++ b/src/Witness_complex/example/example_witness_complex_sphere.cpp
@@ -25,6 +25,7 @@
 #include <gudhi/Simplex_tree.h>
 #include <gudhi/Euclidean_witness_complex.h>
 #include <gudhi/pick_n_random_points.h>
+#include <gudhi/choose_n_farthest_points.h>
 #include <gudhi/reader_utils.h>
 
 #include <CGAL/Epick_d.h>
@@ -75,7 +76,8 @@ int main(int argc, char * const argv[]) {
 
     // Choose landmarks
     start = clock();
-    Gudhi::subsampling::pick_n_random_points(point_vector, number_of_landmarks, std::back_inserter(landmarks));
+    // Gudhi::subsampling::pick_n_random_points(point_vector, number_of_landmarks, std::back_inserter(landmarks));
+    Gudhi::subsampling::choose_n_farthest_points(K(), point_vector, number_of_landmarks, Gudhi::subsampling::random_starting_point, std::back_inserter(landmarks));
 
     // Compute witness complex
     Witness_complex witness_complex(landmarks,
-- 
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