Add doc for exact alpha

CMake for exact alpha
Factorization


git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/alpha_3d_fix@2170 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: b2ac281dd21313602590fc834e7ad22bbf081021

1 files changed, 12 insertions, 0 deletions

diff --git a/src/Persistent_cohomology/doc/Intro_persistent_cohomology.h b/src/Persistent_cohomology/doc/Intro_persistent_cohomology.h
index 40dd3f93..d758687c 100644
--- a/src/Persistent_cohomology/doc/Intro_persistent_cohomology.h
+++ b/src/Persistent_cohomology/doc/Intro_persistent_cohomology.h
@@ -172,6 +172,18 @@ Persistent_cohomology/alpha_complex_3d_persistence.cpp</a> computes the persiste
 2  1 0.0934117 1.00003 
 2  2 0.56444 1.03938 \endcode
 
+\li <a href="_persistent_cohomology_2exact_alpha_complex_3d_persistence_8cpp-example.html">
+Persistent_cohomology/exact_alpha_complex_3d_persistence.cpp</a> computes the persistent homology with
+\f$\mathbb{Z}/2\mathbb{Z}\f$ coefficients of the alpha complex on points sampling from an OFF file.
+Here, as CGAL computes the exact values, it is slower, but it is necessary when points are on a grid
+for instance.
+\code $> ./exact_alpha_complex_3d_persistence ../../data/points/tore3D_300.off 2 0.45 \endcode
+\code Simplex_tree dim: 3
+2  0 0 inf
+2  1 0.0682162 1.0001
+2  1 0.0934117 1.00003
+2  2 0.56444 1.03938 \endcode
+
 \li <a href="_persistent_cohomology_2alpha_complex_persistence_8cpp-example.html">
 Persistent_cohomology/alpha_complex_persistence.cpp</a> computes the persistent homology with
 \f$\mathbb{Z}/p\mathbb{Z}\f$ coefficients of the alpha complex on points sampling from an OFF file.