From: Ian Jackson <ian@davenant.relativity.greenend.org.uk>
Date: Fri, 4 Jan 2008 19:21:11 +0000 (+0000)
Subject: get sign right, but it is still wrong
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?a=commitdiff_plain;h=7e2e842bbff916e29b2927ae2057b8028b475a32;p=moebius2.git

get sign right, but it is still wrong
---

diff --git a/graph.c b/graph.c
index 31e317d..74d93bf 100644
--- a/graph.c
+++ b/graph.c
@@ -44,7 +44,7 @@ void graph_layout_prepare() {
     breadth_first_search(v1, sqdistances[v1]);
 
   alpha= 2;
-  beta= -log(10)/log(alpha);
+  beta= log(10)/log(alpha);
   beta_prime= (1-beta)/2;
   printf("alpha=%g beta=%g beta'=%g\n", alpha,beta,beta_prime);
 }
@@ -93,7 +93,7 @@ double graph_layout_cost(const Vertices v, const double vertex_areas[N]) {
 
       double s2= dist2 * meanedgelength2;
 
-      /* energy = (d/s)^(1-beta)     where beta is -log\_{alpha}(10)
+      /* energy = (d/s)^(1-beta)     where beta is log\_{alpha}(10)
        * energy = ((d/s)^2) ^ (1-beta)/2
        *          let beta' = (1-beta)/2
        */