diff options
Diffstat (limited to 'src/c/elementaryFunctions/log1p/dlog1ps.c')
-rw-r--r-- | src/c/elementaryFunctions/log1p/dlog1ps.c | 67 |
1 files changed, 34 insertions, 33 deletions
diff --git a/src/c/elementaryFunctions/log1p/dlog1ps.c b/src/c/elementaryFunctions/log1p/dlog1ps.c index 4c055c86..e75a05fd 100644 --- a/src/c/elementaryFunctions/log1p/dlog1ps.c +++ b/src/c/elementaryFunctions/log1p/dlog1ps.c @@ -1,33 +1,34 @@ -/* - * Scilab ( http://www.scilab.org/ ) - This file is part of Scilab - * Copyright (C) 2008-2008 - INRIA - Bruno JOFRET - * - * 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" - -double dlog1ps(double 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 dlnp1m1s(in / (in + 2)); - } - else - {/* use the standard formula */ - return dlogs(in + 1); - } -} +/*
+ * 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"
+
+double dlog1ps(double 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 dlnp1m1s(in / (in + 2));
+ }
+ else
+ {/* use the standard formula */
+ return dlogs(in + 1);
+ }
+}
|