2016 Update

Task/Averages-Mean-angle/Elixir/averages-mean-angle.elixir

@@ -0,0 +1,21 @@
+defmodule MeanAngle do
+  def mean_angle(angles) do
+    rad_angles = Enum.map(angles, &deg_to_rad/1)
+    sines = rad_angles |> Enum.map(&:math.sin/1) |> Enum.sum
+    cosines = rad_angles |> Enum.map(&:math.cos/1) |> Enum.sum
+
+    rad_to_deg(:math.atan2(sines, cosines))
+  end
+
+  defp deg_to_rad(a) do
+    (:math.pi/180) * a
+  end
+
+  defp rad_to_deg(a) do
+    (180/:math.pi) * a
+  end
+end
+
+IO.inspect MeanAngle.mean_angle([10, 350])
+IO.inspect MeanAngle.mean_angle([90, 180, 270, 360])
+IO.inspect MeanAngle.mean_angle([10, 20, 30])