1^^Infinity tetration special case fix #261

mariuszgromada · May 29, 2022 · f9719ca · f9719ca
1 parent e90ce11
commit f9719ca
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diff --git a/CURRENT/c-sharp/src/org/mariuszgromada/math/mxparser/mathcollection/MathFunctions.cs b/CURRENT/c-sharp/src/org/mariuszgromada/math/mxparser/mathcollection/MathFunctions.cs
@@ -1280,6 +1280,7 @@ public static double tetration(double a, double n) {
 			if (Double.IsNaN(a)) return Double.NaN;
 			if (Double.IsNaN(n)) return Double.NaN;
 			if (Double.IsPositiveInfinity(n)) {
+				if (BinaryRelations.isEqualOrAlmost(a, 1)) return 1.0;
 				if (abs(a - MathConstants.EXP_MINUS_E) <= BinaryRelations.DEFAULT_COMPARISON_EPSILON)
 					return MathConstants.EXP_MINUS_1;
 				if (abs(a - MathConstants.EXP_1_OVER_E) <= BinaryRelations.DEFAULT_COMPARISON_EPSILON)

diff --git a/CURRENT/java/src/org/mariuszgromada/math/mxparser/mathcollection/MathFunctions.java b/CURRENT/java/src/org/mariuszgromada/math/mxparser/mathcollection/MathFunctions.java
@@ -1148,6 +1148,7 @@ public static double tetration(double a, double n) {
 		if (Double.isNaN(a)) return Double.NaN;
 		if (Double.isNaN(n)) return Double.NaN;
 		if (n == Double.POSITIVE_INFINITY) {
+			if (BinaryRelations.isEqualOrAlmost(a, 1)) return 1.0;
 			if (abs(a - MathConstants.EXP_MINUS_E) <= BinaryRelations.DEFAULT_COMPARISON_EPSILON)
 				return MathConstants.EXP_MINUS_1;
 			if (abs(a - MathConstants.EXP_1_OVER_E) <= BinaryRelations.DEFAULT_COMPARISON_EPSILON)