From db464f35f5a10b58d9ed1085e0b462689adee583 Mon Sep 17 00:00:00 2001
From: Siddhesh Wani
Date: Mon, 25 May 2015 14:46:31 +0530
Subject: Original Version
---
src/c/elementaryFunctions/log1p/slog1ps.c | 35 +++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
create mode 100644 src/c/elementaryFunctions/log1p/slog1ps.c
(limited to 'src/c/elementaryFunctions/log1p/slog1ps.c')
diff --git a/src/c/elementaryFunctions/log1p/slog1ps.c b/src/c/elementaryFunctions/log1p/slog1ps.c
new file mode 100644
index 00000000..04786524
--- /dev/null
+++ b/src/c/elementaryFunctions/log1p/slog1ps.c
@@ -0,0 +1,35 @@
+/*
+ * Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+ * Copyright (C) 2008-2008 - INRIA - Bruno JOFRET
+ * Copyright (C) Bruno Pincon
+
+ *
+ * This file must be used under the terms of the CeCILL.
+ * This source file is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at
+ * http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
+ *
+ */
+
+#include "log1p.h"
+#include "log.h"
+#include "lnp1m1.h"
+
+float slog1ps(float in) {
+ static double A = -1.0/3.0;
+ static double B = 0.5;
+
+ if(in < -1)
+ {/* got NaN */
+ return (in - in) / (in - in); /* NaN */
+ }
+ else if(A <= in && in <= B)
+ {/* use the function log((1+g)/(1-g)) with g = x/(x + 2) */
+ return slnp1m1s(in / (in + 2));
+ }
+ else
+ {/* use the standard formula */
+ return slogs(in + 1);
+ }
+}
--
cgit