2016 Update

Task/Averages-Pythagorean-means/Java/averages-pythagorean-means-2.java

@@ -0,0 +1,36 @@
+   public static double arithmAverage(double array[]){
+       if (array == null ||array.length == 0) {
+         return 0.0;
+      }
+      else {
+         return DoubleStream.of(array).average().getAsDouble();
+      }
+   }
+
+    public static double geomAverage(double array[]){
+      if (array == null ||array.length == 0) {
+         return 0.0;
+      }
+      else {
+         double aver = DoubleStream.of(array).reduce(1, (x, y) -> x * y);
+         return   Math.pow(aver, 1.0 / array.length);
+      }
+   }
+
+     public static double harmAverage(double array[]){
+         if (array == null ||array.length == 0) {
+         return 0.0;
+      }
+      else {
+         double aver = DoubleStream.of(array)
+                  // remove null values
+                  .filter(n -> n > 0.0)
+                  // generate 1/n array
+                  .map( n-> 1.0/n)
+                  // accumulating
+                  .reduce(0, (x, y) -> x + y);
+                  // just this reduce is not working- need to do in 2 steps
+                 // .reduce(0, (x, y) -> 1.0/x + 1.0/y);
+         return   array.length / aver ;
+      }
+   }