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| author | Eli Zaretskii <eliz@gnu.org> | 2002-02-19 11:03:54 +0000 |
|---|---|---|
| committer | Eli Zaretskii <eliz@gnu.org> | 2002-02-19 11:03:54 +0000 |
| commit | f120431c7ecafeded71dda4c2498dca8c9a8849e (patch) | |
| tree | e7f78efaa2a773af083c63d701902ae082287c55 /lispref/numbers.texi | |
| parent | 250ffca65ee61183ebab25a4a301444cb9a51e9c (diff) | |
| download | emacs-f120431c7ecafeded71dda4c2498dca8c9a8849e.tar.gz | |
(Math Functions): Document the optional second arg of atan.
Diffstat (limited to 'lispref/numbers.texi')
| -rw-r--r-- | lispref/numbers.texi | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lispref/numbers.texi b/lispref/numbers.texi index 9689d5cedfe..e13bd04117a 100644 --- a/lispref/numbers.texi +++ b/lispref/numbers.texi @@ -1046,8 +1046,8 @@ pi is out of range (outside [-1, 1]), then the result is a NaN. @end defun -@defun atan arg -The value of @code{(atan @var{arg})} is a number between +@defun atan y &optional x +The value of @code{(atan @var{y})} is a number between @ifnottex @minus{}pi/2 @end ifnottex @@ -1061,7 +1061,10 @@ pi/2 @tex @math{\pi/2} @end tex -(exclusive) whose tangent is @var{arg}. +(exclusive) whose tangent is @var{y}. If the optional second +argument @var{x} is given, the value of @code{(atan y x)} is the +angle in radians between the vector @code{[@var{x}, @var{y}]} and the +@code{X} axis. @end defun @defun exp arg |