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
+}

Task/Entropy/Go/entropy-2.go

@@ -5,14 +5,14 @@ import (
     "math"
 )
 
-const s = "1223334444"
-
 func main() {
+    const s = "1223334444"
+
     m := map[rune]float64{}
     for _, r := range s {
         m[r]++
     }
-    hm := 0.
+    var fm float64
     for _, c := range m {
         hm += c * math.Log2(c)
     }