Changeset 17963 for trunk/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Interpreter

Timestamp:

04/23/21 18:26:45 (3 years ago)

Author:

gkronber

Message:

#3121: support integer powers in interval arithmetic (and two simplification rules)

Location:

trunk/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Interpreter

Files:

• IntervalInterpreter.cs (modified) (2 diffs)
• OpCodes.cs (modified) (1 diff)

trunk/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Interpreter/IntervalInterpreter.cs

@@ -283 +283 @@
             break;
           }
+        case OpCodes.Power: {
+            var a = Evaluate(instructions, ref instructionCounter, nodeIntervals, variableIntervals);
+            var b = Evaluate(instructions, ref instructionCounter, nodeIntervals, variableIntervals);
+            // support only integer powers
+            if(b.LowerBound == b.UpperBound && Math.Truncate(b.LowerBound) == b.LowerBound) {
+              result = Interval.Power(a, (int)b.LowerBound);
+            } else {
+              throw new NotSupportedException("Interval is only supported for integer powers");
+            }
+            break;
+          }
+
         case OpCodes.Absolute: {
             var argumentInterval = Evaluate(instructions, ref instructionCounter, nodeIntervals, variableIntervals);
@@ -329 +341 @@
           !(n.Symbol is Cube) &&
           !(n.Symbol is CubeRoot) &&
+          !(n.Symbol is Power) &&
           !(n.Symbol is Absolute) &&
           !(n.Symbol is AnalyticQuotient)

trunk/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Interpreter/OpCodes.cs

@@ -144 +144 @@
       { typeof(Cosine), OpCodes.Cos },
       { typeof(Tangent), OpCodes.Tan },
-      { typeof (HyperbolicTangent), OpCodes.Tanh},
+      { typeof(HyperbolicTangent), OpCodes.Tanh},
       { typeof(Logarithm), OpCodes.Log },
       { typeof(Exponential), OpCodes.Exp },