Path: utzoo!utgpu!watmath!watcgl!fjhenigman
From: fjhenigman@watcgl.waterloo.edu (Frank J. Henigman)
Newsgroups: comp.sys.sgi
Subject: atan2(0, 0) = ???
Keywords: math
Message-ID: <9868@watcgl.waterloo.edu>
Date: 24 May 89 00:01:26 GMT
Distribution: comp
Organization: U of Waterloo, Ontario
Lines: 13


The man page for atan2 explicitly states that atan2(0, 0) = 0.
However the following program outputs NaN.

#include <math.h>
main() { printf("%f\n", atan2(0.0, 0.0)); }

Which is wrong: the man page or atan2?
(I tried both libm and libm43 on a Personal Iris and a 4D.)
-- 
fjhenigman@watcgl.uwaterloo.ca                       Computer Graphics Lab
fjhenigman@watcgl.waterloo.edu   Frank J. Henigman   University of Waterloo
 ...!watmath!watcgl!fjhenigman                       Waterloo, Ontario, Canada