From owner-bug-octave at bevo dot che dot wisc dot edu  Sat Nov 11 13:23:28 1995
Subject: atan2
From: John Eaton <jwe at bevo dot che dot wisc dot edu>
To: Jack Mott <jackm at pmafire dot inel dot gov>
Cc: bug-octave at che dot utexas dot edu
Date: Sat, 11 Nov 1995 13:23:20 -0600

Jack Mott <jackm at pmafire dot inel dot gov> wrote:

: The atan2 function in octave does not appear to correctly handle 
: arguments in the second quadrant:
: 
:     octave:40> atan2(1,-1)
:     ans = -2.3562
: 
: The answer should have been positive.

This appears to be fixed in my current sources:

$ octave
Octave, version ss-951108 (alpha-dec-osf3.2).
Copyright (C) 1992, 1993, 1994, 1995 John W. Eaton.
This is free software with ABSOLUTELY NO WARRANTY.
For details, type `warranty'.

octave:1> atan2 (1, -1)
ans = 2.3562

It also appears to work correctly for me in version 1.1.1.  What
version do you have?

Thanks,

jwe