From e4b687d1f69f90e58aad55bdaef9c3fce29bc211 Mon Sep 17 00:00:00 2001
From: Ahmet Inan <inan@aicodix.de>
Date: Fri, 17 Jan 2020 19:02:15 +0100
Subject: [PATCH] be consistend and use one sided difference if outside

---
 spline.hh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/spline.hh b/spline.hh
index 829f2eb..55bb11d 100644
--- a/spline.hh
+++ b/spline.hh
@@ -102,7 +102,7 @@ struct CubicHermiteSpline
 		: k < n ?
 			eval(X, Y, (x - X[k-1]) / (X[k] - X[k-1]), k-1, n)
 		:
-			eval(X, Y, (x - X[n-2]) / (X[n-1] - X[n-2]), n-2, n);
+			eval(X, Y, (x - X[n-2]) / (X[n-1] - X[n-2]), n-1, n);
 	}
 	static constexpr OTYPE left(const OTYPE *Y)
 	{