Data commit

Task/Cumulative-standard-deviation/Objeck/cumulative-standard-deviation.objeck

@@ -0,0 +1,35 @@
+use Structure;
+
+bundle Default {
+  class StdDev {
+    nums : FloatVector;
+
+    New() {
+      nums := FloatVector->New();
+    }
+
+    function : Main(args : String[]) ~ Nil {
+      sd := StdDev->New();
+      test_data := [2.0, 4.0, 4.0, 4.0, 5.0, 5.0, 7.0, 9.0];
+      each(i : test_data) {
+        sd->AddNum(test_data[i]);
+        sd->GetSD()->PrintLine();
+      };
+    }
+
+    method : public : AddNum(num : Float) ~ Nil {
+      nums->AddBack(num);
+    }
+
+    method : public : native : GetSD() ~ Float {
+      sq_diffs := 0.0;
+      avg := nums->Average();
+      each(i : nums) {
+        num := nums->Get(i);
+        sq_diffs += (num - avg) * (num - avg);
+      };
+
+      return (sq_diffs / nums->Size())->SquareRoot();
+    }
+  }
+}