From: Eli Zaretskii <eliz@gnu.org>
Date: Tue, 19 Feb 2002 11:07:20 +0000 (+0000)
Subject: Document the optional second arg of `atan'.
X-Git-Tag: ttn-vms-21-2-B4~16572
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=c4f59bcf1fddba7cd6f9aa7de0320011048f1074;p=emacs.git

Document the optional second arg of `atan'.
---

diff --git a/etc/NEWS b/etc/NEWS
index 6ab8d2b2bcb..00f15dfd5b6 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -625,6 +625,13 @@ and the latter now controls scrolling down.
 This is like window-height but does not count the mode line
 or the header line.
 
++++
+** The function `atan' now accepts an optional second argument.
+
+When called with 2 arguments, as in `(atan Y X)', `atan' returns the
+angle in radians between the vector [X, Y] and the X axis.  (This is
+equivalent to the standard C library function `atan2'.)
+
 +++
 ** You can now make a window as short as one line.