documented sin_cos

git-svn-id: svn://scm.gforge.inria.fr/svn/mpc/trunk@858 211d60ee-9f03-0410-a15a-8952a2c7a4e4

3 files changed, 11 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 0436bbd..95fe789 100644
--- a/NEWS
+++ b/NEWS
@@ -3,6 +3,7 @@ Changes in version 0.8.3:
     - mpc_set_dc, mpc_set_ldc, mpc_get_dc, mpc_get_ldc for converting
       between mpc type variables and C variables of type double _Complex
       or long double _Complex
+    - mpc_sin_cos, computing simultaneously the sine and cosine
   - Speed-up of mpc_pow_si through binary exponentiation, and of
     mpc_pow_z when the exponent fits in a long
   - Bug fixes:
diff --git a/doc/mpc.texi b/doc/mpc.texi
index ccccdb6..256977c 100644
--- a/doc/mpc.texi
+++ b/doc/mpc.texi
@@ -1012,6 +1012,13 @@ Set @var{rop} to the cosine of @var{op},
 rounded according to @var{rnd} with the precision of @var{rop}.
 @end deftypefun
 
+@deftypefun int mpc_sin_cos (mpc_t @var{rop_sin}, mpc_t @var{rop_cos}, mpc_t @var{op}, mpc_rnd_t @var{rnd_sin}, mpc_rnd_t @var{rnd_cos})
+Set @var{rop_sin} to the sine of @var{op},
+rounded according to @var{rnd_sin} with the precision of @var{rop_sin},
+and @var{rop_cos} to the cosine of @var{op},
+rounded according to @var{rnd_cos} with the precision of @var{rop_cos}.
+@end deftypefun
+
 @deftypefun int mpc_tan (mpc_t @var{rop}, mpc_t @var{op}, mpc_rnd_t @var{rnd})
 Set @var{rop} to the tangent of @var{op},
 rounded according to @var{rnd} with the precision of @var{rop}.
diff --git a/src/sin_cos.c b/src/sin_cos.c
index e117ba8..20a3d6c 100644
--- a/src/sin_cos.c
+++ b/src/sin_cos.c
@@ -246,6 +246,9 @@ mpc_sin_cos_imag (mpc_ptr rop_sin, mpc_ptr rop_cos, mpc_srcptr op,
 int
 mpc_sin_cos (mpc_ptr rop_sin, mpc_ptr rop_cos, mpc_srcptr op,
    mpc_rnd_t rnd_sin, mpc_rnd_t rnd_cos)
+   /* Feature not documented in the texinfo file: One of rop_sin or
+      rop_cos may be NULL, in which case it is not computed, and the
+      corresponding ternary inexact value is set to 0 (exact).       */
 {
    int inex_sin, inex_cos;