Huffman base2/3

Esiur.Analysis/Coding/Functions.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Esiur.Analysis.Coding
+{
+    public static class Functions
+    {
+        public static double Entropy(int[] frequencies)
+        {
+            double total = frequencies.Sum();
+
+            return frequencies.Sum(x => ((double)x / total * -Log2(x)));
+        }
+
+        public static double Log2(double value) => Math.Log10(value) / Math.Log10(2);
+    }
+}