Use Delegate for histogram distance

src/Numerics/Statistics/Histogram.cs

@@ -469,31 +469,12 @@ namespace MathNet.Numerics.Statistics
         }
 
         /// <summary>
-        /// Calculate the Minkowski Distance between two histograms
+        /// Calculate the Distance between two histograms
         /// </summary>
         /// <param name="h">The histogram that will be compared with this histogram</param>
         /// <param name="power">The power used for calculating the distance (e.g. 2 for Ecludian distance)</param>
+        /// <param name="distanceFunction">A delegate for the distance function</param>
         /// <returns>The distance between the two histograms</returns>
-        public double MinkowskiDistance(Histogram h, int power)
-        {
-            if (this.BucketCount != h.BucketCount)
-            {
-                throw new ArgumentException("The two histograms must have the same number of buckets");
-            }
-            if (power < 1)
-            {
-                throw new ArgumentException("The power must be greater than zero");
-            }
-            double[] a1 = new double[this.BucketCount];
-            double[] a2 = new double[this.BucketCount];
-            for (int i = 0; i < this.BucketCount; i++)
-            {
-                a1[i] = this[i].Count;
-                a2[i] = h[i].Count;
-            }
-            return Distance.Minkowski(2, a1, a2);
-        }
-
         public double HistogramDistance(Histogram h, double power, Func<double, double[], double[], double> distanceFunction){
             if (this.BucketCount != h.BucketCount)
             {
@@ -509,6 +490,12 @@ namespace MathNet.Numerics.Statistics
             return distanceFunction(power, a1, a2);
         }
 
+        /// <summary>
+        /// Calculate the Distance between two histograms
+        /// </summary>
+        /// <param name="h">The histogram that will be compared with this histogram</param>
+        /// <param name="distanceFunction">A delegate for the distance function</param>
+        /// <returns>The distance between the two histograms</returns>
         public double HistogramDistance(Histogram h, Func<double[], double[], double> distanceFunction)
         {
             if (this.BucketCount != h.BucketCount)