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-rw-r--r--src/Bitmap_cubical_complex/doc/Gudhi_Cubical_Complex_doc.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/src/Bitmap_cubical_complex/doc/Gudhi_Cubical_Complex_doc.h b/src/Bitmap_cubical_complex/doc/Gudhi_Cubical_Complex_doc.h
index d1836ef0..0c70c6e0 100644
--- a/src/Bitmap_cubical_complex/doc/Gudhi_Cubical_Complex_doc.h
+++ b/src/Bitmap_cubical_complex/doc/Gudhi_Cubical_Complex_doc.h
@@ -90,8 +90,11 @@ namespace cubical_complex {
* In the current implantation, filtration is given at the maximal cubes, and it is then extended by the lower star
* filtration to all cubes. There are a number of constructors that can be used to construct cubical complex by users
* who want to use the code directly. They can be found in the \a Bitmap_cubical_complex class.
- * Currently one input from a text file is used. It uses a format used already in Perseus software
- * (http://www.sas.upenn.edu/~vnanda/perseus/) by Vidit Nanda. The file format is described here: \ref FileFormatsPerseus.
+ * Currently one input from a text file is used. It uses a format nspired from the Perseus software
+ * (http://www.sas.upenn.edu/~vnanda/perseus/) by Vidit Nanda. Note however an important difference: while Perseus assume
+ * the filtration of all maximal cubes to be non-negative, over here we do not enforce this and we allow any filtration values.
+ * As a consequence one cannot use -1's to indicate missing cubes. If you have missing cubes in your complex, please set
+ * their filtration to +Inf. The file format is described in details in here: \ref FileFormatsPerseus.
*
* \section PeriodicBoundaryConditions Periodic boundary conditions
* Often one would like to impose periodic boundary conditions to the cubical complex. Let \f$ I_1\times ... \times