Changeset 18032 for trunk/HeuristicLab.Problems.Instances.DataAnalysis/3.3/Regression/ValueGenerator.cs

Timestamp:

07/27/21 13:30:00 (3 years ago)

Author:

chaider

Message:

#3075 noise generation method to ValueGenerator; use same method for generating noise in friedman and feynman instances

File:

• trunk/HeuristicLab.Problems.Instances.DataAnalysis/3.3/Regression/ValueGenerator.cs (modified) (2 diffs)

trunk/HeuristicLab.Problems.Instances.DataAnalysis/3.3/Regression/ValueGenerator.cs

@@ -20 +20 @@
 #endregion
 
+using System;
 using System.Collections.Generic;
 using System.Linq;
+using HeuristicLab.Common;
+using HeuristicLab.Core;
 using HeuristicLab.Random;
 
@@ -97 +100 @@
       }
     }
+
+    public static List<double> GenerateNoise(IEnumerable<double> target, IRandom rand, double? noiseRatio) {
+      if (noiseRatio == null) return null;
+
+      var targetNoise = new List<double>();
+      var targetSigma = target.StandardDeviation();
+      var noisePrng = new NormalDistributedRandomPolar(rand, 0, targetSigma * Math.Sqrt(noiseRatio.Value / (1.0 - noiseRatio.Value)));
+
+      targetNoise.AddRange(target.Select(t => t + noisePrng.NextDouble()).ToList());
+      return targetNoise;
+    }
   }
 }