1 files changed, 14 insertions, 14 deletions

diff --git a/src/Cech_complex/example/cech_complex_step_by_step.cpp b/src/Cech_complex/example/cech_complex_step_by_step.cpp
index b3d05697..f59f0293 100644
--- a/src/Cech_complex/example/cech_complex_step_by_step.cpp
+++ b/src/Cech_complex/example/cech_complex_step_by_step.cpp
@@ -51,12 +51,12 @@ class Cech_blocker {
     for (auto vertex : simplex_tree_.simplex_vertex_range(sh)) {
       points.push_back(point_cloud_[vertex]);
 #ifdef DEBUG_TRACES
-      std::cout << "#(" << vertex << ")#";
+      std::clog << "#(" << vertex << ")#";
 #endif  // DEBUG_TRACES
     }
     Filtration_value radius = Gudhi::Minimal_enclosing_ball_radius()(points);
 #ifdef DEBUG_TRACES
-    std::cout << "radius = " << radius << " - " << (radius > max_radius_) << std::endl;
+    std::clog << "radius = " << radius << " - " << (radius > max_radius_) << std::endl;
 #endif  // DEBUG_TRACES
     simplex_tree_.assign_filtration(sh, radius);
     return (radius > max_radius_);
@@ -96,23 +96,23 @@ int main(int argc, char* argv[]) {
   // expand the graph until dimension dim_max
   st.expansion_with_blockers(dim_max, Cech_blocker(st, max_radius, off_reader.get_point_cloud()));
 
-  std::cout << "The complex contains " << st.num_simplices() << " simplices \n";
-  std::cout << "   and has dimension " << st.dimension() << " \n";
+  std::clog << "The complex contains " << st.num_simplices() << " simplices \n";
+  std::clog << "   and has dimension " << st.dimension() << " \n";
 
   // Sort the simplices in the order of the filtration
   st.initialize_filtration();
 
 #if DEBUG_TRACES
-  std::cout << "********************************************************************\n";
-  std::cout << "* The complex contains " << st.num_simplices() << " simplices - dimension=" << st.dimension() << "\n";
-  std::cout << "* Iterator on Simplices in the filtration, with [filtration value]:\n";
+  std::clog << "********************************************************************\n";
+  std::clog << "* The complex contains " << st.num_simplices() << " simplices - dimension=" << st.dimension() << "\n";
+  std::clog << "* Iterator on Simplices in the filtration, with [filtration value]:\n";
   for (auto f_simplex : st.filtration_simplex_range()) {
-    std::cout << "   "
+    std::clog << "   "
               << "[" << st.filtration(f_simplex) << "] ";
     for (auto vertex : st.simplex_vertex_range(f_simplex)) {
-      std::cout << static_cast<int>(vertex) << " ";
+      std::clog << static_cast<int>(vertex) << " ";
     }
-    std::cout << std::endl;
+    std::clog << std::endl;
   }
 #endif  // DEBUG_TRACES
 
@@ -144,11 +144,11 @@ void program_options(int argc, char* argv[], std::string& off_file_points, Filtr
   po::notify(vm);
 
   if (vm.count("help") || !vm.count("input-file")) {
-    std::cout << std::endl;
-    std::cout << "Construct a Cech complex defined on a set of input points.\n \n";
+    std::clog << std::endl;
+    std::clog << "Construct a Cech complex defined on a set of input points.\n \n";
 
-    std::cout << "Usage: " << argv[0] << " [options] input-file" << std::endl << std::endl;
-    std::cout << visible << std::endl;
+    std::clog << "Usage: " << argv[0] << " [options] input-file" << std::endl << std::endl;
+    std::clog << visible << std::endl;
     exit(-1);
   }
 }