September 2017 Update

Task/Entropy/Go/entropy-1.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+    "fmt"
+    "math"
+    "strings"
+)
+
+func main(){
+    fmt.Println(H("1223334444"))
+}
+
+func H(data string) (entropy float64) {
+    if data == "" {
+        return 0
+    }
+    for i := 0; i < 256; i++ {
+        px := float64(strings.Count(data, string(byte(i)))) / float64(len(data))
+        if px > 0 {
+	    entropy += -px * math.Log2(px)
+	}
+    }
+    return entropy
+}