From 9f9c79bc953f7c5e15a0c1cf45e32ddf86ee3c52 Mon Sep 17 00:00:00 2001
From: Joseph Lizier <joseph.lizier@gmail.com>
Date: Fri, 17 May 2019 22:24:54 +1000
Subject: [PATCH] Handling infinites in Chi square CDF function properly

---
 java/source/infodynamics/utils/MathsUtils.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/java/source/infodynamics/utils/MathsUtils.java b/java/source/infodynamics/utils/MathsUtils.java
index 7682b64..d438c5a 100755
--- a/java/source/infodynamics/utils/MathsUtils.java
+++ b/java/source/infodynamics/utils/MathsUtils.java
@@ -354,6 +354,9 @@ public class MathsUtils {
 		if (k <= 0) {
 			throw new IllegalArgumentException("k (" + k + ") must be > 0");
 		}
+		if (Double.isInfinite(x) && (x > 0)) {
+			return 1.0;
+		}
 		// Old approach: (not numerically stable):
 		// return lowerIncompleteGammaFunctionOfArgsOn2(k,x) /
 		//		gammaOfArgOn2Plus1(k-2); // denominator is Gamma(k/2)