Add iso-cuboid file format

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/add_utils_in_gudhi_v2@2882 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: ad82867ef7523c4a03fdb89054e5bd7b8d40f7da

1 files changed, 2 insertions, 1 deletions

diff --git a/src/Alpha_complex/utilities/README b/src/Alpha_complex/utilities/README
index abb17bf7..67ea1875 100644
--- a/src/Alpha_complex/utilities/README
+++ b/src/Alpha_complex/utilities/README
@@ -48,9 +48,10 @@ This program computes the persistent homology with coefficient field Z/pZ of the
 where `dim` is the dimension of the homological feature, `b` and `d` are respectively the birth and death of the feature, and `p` is the characteristic of the field *Z/pZ* used for homology coefficients (`p` must be a prime number).
 
 **Usage**
-`periodic_alpha_complex_3d_persistence <input OFF file> <p> <min_persistence>`
+`periodic_alpha_complex_3d_persistence <input OFF file> <cuboid file> <p> <min_persistence>`
 where
 `<input OFF file>` is the path to the input point cloud in OFF format.
+`<cuboid file>` is the path to the file describing the periodic domain. It must be in the format described [here](http://gudhi.gforge.inria.fr/doc/latest/fileformats.html#FileFormatsIsoCuboid).
 `<p>` is the characteristic p of the coefficient field *Z/pZ* for computing homology. It must be a stricly positive integer.
 `<min_persistence>` is the minimal lifetime of homology feature to be recorded. Enter a negative value to see zero length intervals.