Cumulative standard deviation: Difference between revisions

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@@ Line 2,886: / Line 2,886: @@
 =={{header|Scala}}==
 {{libheader|Scala}}
-<lang Scala>import scala.math._
+<lang Scala>import scala.math.sqrt
-import Numeric.Implicits._
 object StddevCalc extends App {
-  def avg[T](ts: Iterable[T])(implicit num: Fractional[T]): T = {
-    num.div(ts.sum, num.fromInt(ts.size)) // Leaving with type of function T
-  }
   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 = avg(ts) // Leave val type of T
     val stdDev = // Root of mean diffs
+      sqrt(num.toDouble(
-      sqrt(num.toDouble(ts.foldLeft(num.zero)((b, a) => num.plus(b, num.times(num.minus(a, mean), num.minus(a, mean))))) / ts.size)
+        ts.foldLeft(num.zero)((b, a) =>
+          num.plus(b, num.times(num.minus(a, mean), num.minus(a, mean))))) /
+        ts.size)
     (mean, stdDev)
   }