Data commit

Task/Cumulative-standard-deviation/Go/cumulative-standard-deviation.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+    "fmt"
+    "math"
+)
+
+func newRsdv() func(float64) float64 {
+    var n, a, q  float64
+    return func(x float64) float64 {
+        n++
+        a1 := a+(x-a)/n
+        q, a = q+(x-a)*(x-a1), a1
+        return math.Sqrt(q/n)
+    }
+}
+
+func main() {
+    r := newRsdv()
+    for _, x := range []float64{2,4,4,4,5,5,7,9} {
+        fmt.Println(r(x))
+    }
+}