Add functions mpfr_sech, mpfr_coth and mpfr_csch.

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@3526 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 34 insertions, 0 deletions

diff --git a/sech.c b/sech.c
new file mode 100644
index 000000000..2630e923f
--- /dev/null
+++ b/sech.c
@@ -0,0 +1,34 @@
+/* mpfr_sech - Hyperbolic secant function = 1/cosh.
+
+Copyright 2005 Free Software Foundation, Inc.
+
+This file is part of the MPFR Library.
+
+The MPFR Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or (at your
+option) any later version.
+
+The MPFR Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the MPFR Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+/* The hyperbolic secant function is defined by sech(x)=1/cosh(x):
+    csc (NaN) = NaN.
+    csc (+Inf) = csc (-Inf) = 0+.
+    csc (+0) = csc (-0) = 1.
+ */
+
+#define FUNCTION mpfr_sech
+#define INVERSE  mpfr_cosh
+#define ACTION_NAN(y) do { MPFR_SET_NAN(y); MPFR_RET_NAN; } while (1)
+#define ACTION_INF(y) return mpfr_set_ui (y, 0, GMP_RNDN)
+#define ACTION_ZERO(y,x) return mpfr_set_ui (y, 1, GMP_RNDN)
+
+#include "gen_inverse.h"