From 7cbb2402a4d01abcbfd3850650f9687b46804723 Mon Sep 17 00:00:00 2001
From: Christoph Helma <helma@in-silico.ch>
Date: Tue, 24 Aug 2010 17:52:33 +0200
Subject: initial lazar version for quantitative descriptors

---
 lib/algorithm.rb | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'lib/algorithm.rb')

diff --git a/lib/algorithm.rb b/lib/algorithm.rb
index 2fde0eb..d7b57af 100644
--- a/lib/algorithm.rb
+++ b/lib/algorithm.rb
@@ -64,6 +64,18 @@ module OpenTox
           0.0
         end
       end
+      def self.euclidean(prop_a,prop_b)
+        common_properties = prop_a.keys & prop_b.keys
+        if common_properties.size > 1
+          dist_sum = 0
+          common_properties.each do |p|
+            dist_sum += (prop_a[p] - prop_b[p])**2
+          end
+          1/(1+Math.sqrt(dist_sum))
+        else
+          nil
+        end
+      end
     end
 
   end
-- 
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