Tagging the 2.0 release of scilab2crelease-2.0

1 files changed, 35 insertions, 0 deletions

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);

+    }

+}