True interleaving distance for the sparse Rips.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/trunk@3964 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: 6c342750c0ea2e7d48e8c3fc9cc2a4d04f8b379b

1 files changed, 2 insertions, 2 deletions

diff --git a/src/Rips_complex/utilities/ripscomplex.md b/src/Rips_complex/utilities/ripscomplex.md
index 6df49310..108cdd50 100644
--- a/src/Rips_complex/utilities/ripscomplex.md
+++ b/src/Rips_complex/utilities/ripscomplex.md
@@ -85,7 +85,7 @@ properly, this is a known issue.
 
 ## sparse_rips_persistence ##
 This program computes the persistent homology with coefficient field *Z/pZ*
-of a sparse (1+epsilon)-approximation of the Rips complex defined on a set of input Euclidean points. The output diagram contains one bar per line, written with the convention:
+of a sparse (1+epsilon)/(1-epsilon)-approximation of the Rips complex defined on a set of input Euclidean points. The output diagram contains one bar per line, written with the convention:
 
 `p dim birth death`
 
@@ -99,7 +99,7 @@ where `dim` is the dimension of the homological feature, `birth` and `death` are
 
 * `-h [ --help ]` Produce help message
 * `-o [ --output-file ]` Name of file in which the persistence diagram is written. Default print in standard output.
-* `-e [ --approximation ]` (default = .5) Epsilon, where the sparse Rips complex is a (1+epsilon)-approximation of the Rips complex.
+* `-e [ --approximation ]` (default = .5) Epsilon, where the sparse Rips complex is a (1+epsilon)/(1-epsilon)-approximation of the Rips complex.
 * `-d [ --cpx-dimension ]` (default = 1) Maximal dimension of the Rips complex we want to compute.
 * `-p [ --field-charac ]` (default = 11)     Characteristic p of the coefficient field Z/pZ for computing homology.
 * `-m [ --min-persistence ]` (default = 0) Minimal lifetime of homology feature to be recorded. Enter a negative value to see zero length intervals.