Add Discount to Numerics

MarketData/MarketDataLib/Numerics/Numerics.cs

@@ -16,6 +16,17 @@ namespace MarketData.Numerical
   {
     public enum CorrelationType{PerfectDownhill,StrongDownhill,ModerateDownhill,WeakDownhill,NoLinearRelationship,WeakUphill,ModerateUphill,StrongUphill,PerfectUphill};
 
+    /// <summary>
+    /// Discount - Discounts the given number by a percentage.  For example to discount $600.00 by 20% call Discount(600.00,.20)
+    /// </summary>
+    /// <param name="number"></param>
+    /// <param name="discountPercentDecimal"></param>
+    /// <returns></returns>
+    public static double Discount(double number, double discountPercentDecimal)
+    {
+      return number * (1.00 - discountPercentDecimal);
+    }
+
 // (i.e.) 2.789  will round to 2.79
     public static double Round(double x)
 		{
@@ -65,7 +76,6 @@ namespace MarketData.Numerical
       double stddev=StdDev(ref observations);
       deviations=Math.Abs(deviations);
       if(deviations<1)deviations=1;
-//      double[] newObservations=(from double value in observations where value<deviations*stddev && value>-2*stddev select value).ToArray<double>();
       double[] newObservations=(from double value in observations where value<deviations*stddev && value > (deviations*-1)*stddev select value).ToArray<double>();
       return newObservations;
     }
@@ -1150,8 +1160,8 @@ namespace MarketData.Numerical
 /// Interpretation of results:
 /// -1 :  A perfect downhill (negative) linear relationship
 /// -0.70 : A strong downhill (negative) linear relationship
-/// <20>0.50. A moderate downhill (negative) relationship
-/// <20>0.30. A weak downhill (negative) linear relationship
+/// <20>0.50. A moderate downhill (negative) relationship
+/// <20>0.30. A weak downhill (negative) linear relationship
 /// 0. No linear relationship
 /// +0.30. A weak uphill (positive) linear relationship
 /// +0.50. A moderate uphill (positive) relationship