From dad6e0aa1133686b374a59217747c6d22f37814c Mon Sep 17 00:00:00 2001
From: Matteo Cypriani <matteo.cypriani@univ-fcomte.fr>
Date: Mon, 13 Feb 2012 14:36:56 +0100
Subject: [PATCH] [Positioner] Measurement::variance_square_distance()

---
 owlps-positioner/src/measurement.hh | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/owlps-positioner/src/measurement.hh b/owlps-positioner/src/measurement.hh
index 3a2dc25..d6c9ed7 100644
--- a/owlps-positioner/src/measurement.hh
+++ b/owlps-positioner/src/measurement.hh
@@ -81,10 +81,14 @@ public:
 
   /** @name Operations */
   //@{
-  /// Computes the distance to another Measurement in SS space
+  /// Computes the distance to another Measurement's SS average
   float ss_square_distance(const Measurement &source) const ;
   /// Computes the distance to another SS value (in dBm)
   float ss_square_distance(const float &ss_dbm) const ;
+  /// Computes the distance to another Measurement's variance
+  float variance_square_distance(const Measurement &source) const ;
+  /// Computes the distance to another variance value
+  float variance_square_distance(const float &var) const ;
   //@}
 
   /** @name Operators */
@@ -161,6 +165,20 @@ inline float Measurement::ss_square_distance(const float &ss_dbm) const
 }
 
 
+inline float Measurement::
+variance_square_distance(const Measurement &source) const
+{
+  return variance_square_distance(source.variance) ;
+}
+
+
+inline float Measurement::
+variance_square_distance(const float &var) const
+{
+  return ((var - variance) * (var - variance)) ;
+}
+
+
 
 /* *** Operators *** */