3 files changed, 17 insertions, 11 deletions

diff --git a/src/Alpha_complex/doc/Intro_alpha_complex.h b/src/Alpha_complex/doc/Intro_alpha_complex.h
index c068b268..5ab23720 100644
--- a/src/Alpha_complex/doc/Intro_alpha_complex.h
+++ b/src/Alpha_complex/doc/Intro_alpha_complex.h
@@ -83,7 +83,7 @@ Table of Contents
  *
  * Then, it is asked to display information about the simplicial complex.
  *
- * \include Alpha_complex/Alpha_complex_from_points.cpp
+ * \include Alpha_complex_from_points.cpp
  *
  * When launching:
  *
@@ -92,7 +92,7 @@ Table of Contents
  *
  * the program output is:
  *
- * \include Alpha_complex/alphaoffreader_for_doc_60.txt
+ * \include alphaoffreader_for_doc_60.txt
  *
  * \section createcomplexalgorithm Create complex algorithm
  *
@@ -152,6 +152,8 @@ Table of Contents
  * not quite define a proper filtration (i.e. non-decreasing with respect to inclusion).
  * We fix that up by calling `SimplicialComplexForAlpha::make_filtration_non_decreasing()`.
  *
+ * \note This is not the case in `exact` version, this is the reason why it is not called in this case.
+ *
  * \subsubsection pruneabove Prune above given filtration value
  *
  * The simplex tree is pruned from the given maximum \f$ \alpha^2 \f$ value (cf.
@@ -171,7 +173,7 @@ Table of Contents
  *
  * Then, it is asked to display information about the alpha complex.
  *
- * \include Alpha_complex/Weighted_alpha_complex_from_points.cpp
+ * \include Weighted_alpha_complex_from_points.cpp
  *
  * When launching:
  *
@@ -180,7 +182,7 @@ Table of Contents
  *
  * the program output is:
  *
- * \include Alpha_complex/weightedalpha3dfrompoints_for_doc.txt
+ * \include weightedalpha3dfrompoints_for_doc.txt
  *
  *
  * \section offexample Example from OFF file
@@ -190,7 +192,7 @@ Table of Contents
  *
  * Then, it is asked to display information about the alpha complex.
  *
- * \include Alpha_complex/Alpha_complex_from_off.cpp
+ * \include Alpha_complex_from_off.cpp
  *
  * When launching:
  *
@@ -199,7 +201,7 @@ Table of Contents
  *
  * the program output is:
  *
- * \include Alpha_complex/alphaoffreader_for_doc_32.txt
+ * \include alphaoffreader_for_doc_32.txt
  *
  *
  * \section weighted3dexample 3d specific version
@@ -215,7 +217,7 @@ Table of Contents
  *
  * Then, it is asked to display information about the alpha complex.
  *
- * \include Alpha_complex/Weighted_alpha_complex_3d_from_points.cpp
+ * \include Weighted_alpha_complex_3d_from_points.cpp
  *
  * The results will be the same as in \ref weightedversion .
  *
diff --git a/src/Alpha_complex/include/gudhi/Alpha_complex.h b/src/Alpha_complex/include/gudhi/Alpha_complex.h
index b315fa99..e03bb161 100644
--- a/src/Alpha_complex/include/gudhi/Alpha_complex.h
+++ b/src/Alpha_complex/include/gudhi/Alpha_complex.h
@@ -435,8 +435,10 @@ class Alpha_complex {
       // --------------------------------------------------------------------------------------------
   
       // --------------------------------------------------------------------------------------------
-      // As Alpha value is an approximation, we have to make filtration non decreasing while increasing the dimension
-      complex.make_filtration_non_decreasing();
+      if (!exact)
+        // As Alpha value is an approximation, we have to make filtration non decreasing while increasing the dimension
+        // Only in not exact version, cf. https://github.com/GUDHI/gudhi-devel/issues/57
+        complex.make_filtration_non_decreasing();
       // Remove all simplices that have a filtration value greater than max_alpha_square
       complex.prune_above_filtration(max_alpha_square);
       // --------------------------------------------------------------------------------------------
diff --git a/src/Alpha_complex/include/gudhi/Alpha_complex_3d.h b/src/Alpha_complex/include/gudhi/Alpha_complex_3d.h
index 4e5fc933..ccc3d852 100644
--- a/src/Alpha_complex/include/gudhi/Alpha_complex_3d.h
+++ b/src/Alpha_complex/include/gudhi/Alpha_complex_3d.h
@@ -554,8 +554,10 @@ Weighted_alpha_complex_3d::Weighted_point_3 wp0(Weighted_alpha_complex_3d::Bare_
     std::clog << "cells \t\t" << count_cells << std::endl;
 #endif  // DEBUG_TRACES
     // --------------------------------------------------------------------------------------------
-    // As Alpha value is an approximation, we have to make filtration non decreasing while increasing the dimension
-    complex.make_filtration_non_decreasing();
+    if (Complexity == complexity::FAST)
+      // As Alpha value is an approximation, we have to make filtration non decreasing while increasing the dimension
+      // Only in FAST version, cf. https://github.com/GUDHI/gudhi-devel/issues/57
+      complex.make_filtration_non_decreasing();
     // Remove all simplices that have a filtration value greater than max_alpha_square
     complex.prune_above_filtration(max_alpha_square);
     // --------------------------------------------------------------------------------------------