Initial data commit

Task/Cumulative-standard-deviation/Scala/cumulative-standard-deviation.scala

@@ -0,0 +1,26 @@
+import scala.math.sqrt
+
+object StddevCalc extends App {
+
+  def calcAvgAndStddev[T](ts: Iterable[T])(implicit num: Fractional[T]): (T, Double) = {
+    def avg(ts: Iterable[T])(implicit num: Fractional[T]): T =
+      num.div(ts.sum, num.fromInt(ts.size)) // Leaving with type of function T
+
+    val mean: T = avg(ts) // Leave val type of T
+    // Root of mean diffs
+    val stdDev = sqrt(ts.map { x =>
+      val diff = num.toDouble(num.minus(x, mean))
+      diff * diff
+    }.sum / ts.size)
+
+    (mean, stdDev)
+  }
+
+  println(calcAvgAndStddev(List(2.0E0, 4.0, 4, 4, 5, 5, 7, 9)))
+  println(calcAvgAndStddev(Set(1.0, 2, 3, 4)))
+  println(calcAvgAndStddev(0.1 to 1.1 by 0.05))
+  println(calcAvgAndStddev(List(BigDecimal(120), BigDecimal(1200))))
+
+  println(s"Successfully completed without errors. [total ${scala.compat.Platform.currentTime - executionStart}ms]")
+
+}