Data commit

Task/Random-numbers/Scala/random-numbers-1.scala

@@ -0,0 +1 @@
+List.fill(1000)(1.0 + 0.5 * scala.util.Random.nextGaussian)

Task/Random-numbers/Scala/random-numbers-2.scala

@@ -0,0 +1,28 @@
+object RandomNumbers extends App {
+
+  val distribution: LazyList[Double] = {
+    def randomNormal: Double = 1.0 + 0.5 * scala.util.Random.nextGaussian
+
+    def normalDistribution(a: Double): LazyList[Double] = a #:: normalDistribution(randomNormal)
+
+    normalDistribution(randomNormal)
+  }
+
+  /*
+   * Let's test it
+   */
+  def calcAvgAndStddev[T](ts: Iterable[T])(implicit num: Fractional[T]): (T, Double) = {
+    val mean: T =
+      num.div(ts.sum, num.fromInt(ts.size)) // Leaving with type of function T
+
+    // Root of mean diffs
+    val stdDev = Math.sqrt(ts.map { x =>
+      val diff = num.toDouble(num.minus(x, mean))
+      diff * diff
+    }.sum / ts.size)
+
+    (mean, stdDev)
+  }
+
+  println(calcAvgAndStddev(distribution.take(1000))) // e.g. (1.0061433267806525,0.5291834867560893)
+}