From d05918402febfa2d115caba52a6c9d23f8233f33 Mon Sep 17 00:00:00 2001
From: Christoph Ruegg <git@cdrnet.ch>
Date: Sun, 13 Apr 2014 17:11:05 +0200
Subject: [PATCH] Distributions: fix sign of Categorical entropy #187

---
 src/Numerics/Distributions/Categorical.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Numerics/Distributions/Categorical.cs b/src/Numerics/Distributions/Categorical.cs
index 2bbf3f8f..6360fccf 100644
--- a/src/Numerics/Distributions/Categorical.cs
+++ b/src/Numerics/Distributions/Categorical.cs
@@ -237,7 +237,7 @@ namespace MathNet.Numerics.Distributions
         /// </summary>
         public double Entropy
         {
-            get { return _pmfNormalized.Sum(p => p*Math.Log(p)); }
+            get { return -_pmfNormalized.Sum(p => p*Math.Log(p)); }
         }
 
         /// <summary>