src/arg.c: Compute the argument of a complex.

src/mpc.h, src/Makefile.am: Add mpc_arg.
doc/mpc.texi: Add documentation for mpc_arg.
tests/arg.dat, tests/targ.c: test files for mpc_arg.
tests/Makefile.am: add test files for mpc_arg.


git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/mpc/trunk@291 211d60ee-9f03-0410-a15a-8952a2c7a4e4

1 files changed, 28 insertions, 0 deletions

diff --git a/src/arg.c b/src/arg.c
new file mode 100644
index 0000000..52363e7
--- /dev/null
+++ b/src/arg.c
@@ -0,0 +1,28 @@
+/* mpc_arg -- Get the argument of a complex number.
+
+Copyright (C) 2008 Philippe Th\'eveny
+
+This file is part of the MPC Library.
+
+The MPC 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 MPC 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 MPC 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. */
+
+#include "mpc.h"
+
+int
+mpc_arg (mpfr_ptr a, mpc_srcptr b, mpfr_rnd_t rnd)
+{
+  return mpfr_atan2 (a, MPC_IM (b), MPC_RE (b), rnd);
+}