Changeset 17549

Timestamp:

05/22/20 09:58:12 (5 years ago)

Author:

chaider

Message:

#2971 Updated root symbol

File:

• branches/2971_named_intervals/HeuristicLab.Problems.DataAnalysis/3.4/Implementation/Interval/Interval.cs (modified) (1 diff)

branches/2971_named_intervals/HeuristicLab.Problems.DataAnalysis/3.4/Implementation/Interval/Interval.cs

@@ -262 +262 @@
       int higher = (int)Math.Round(b.UpperBound);
 
+      //Root root(0,0) = 0
+      if (a.LowerBound == 0 && b.LowerBound == 0 && lower == 0 && higher == 0)
+        return new Interval(0, 0);
+
+      //Root is zero ==> undefined ==> 5^-(1.0/0)
+      if (higher == 0 || lower == 0)
+        return new Interval(double.NaN, double.NaN);
+
+      if (lower < 0 || higher < 0) {
+        List<double> vals = new List<double>();
+
+        vals.Add(Math.Pow(a.LowerBound, 1.0 / lower));
+        vals.Add(Math.Pow(a.LowerBound, 1.0 / higher));
+
+        vals.Add(Math.Pow(a.UpperBound, 1.0 / lower));
+        vals.Add(Math.Pow(a.UpperBound, 1.0 / higher));
+
+        return new Interval(vals.Min(), vals.Max());
+      }
+
       return new Interval(Math.Pow(a.LowerBound, 1.0 / higher), Math.Pow(a.UpperBound, 1.0 / lower));
-      
     }