From tlumley at u.washington.edu  Fri Jan  6 16:15:40 2006
From: tlumley at u.washington.edu (Thomas Lumley)
Date: Fri, 6 Jan 2006 07:15:40 -0800 (PST)
Subject: [Rd] Multiplication (PR#8466)
In-Reply-To: <20060106144345.5682219AC0@slim.kubism.ku.dk>
References: <20060106144345.5682219AC0@slim.kubism.ku.dk>
Message-ID: <Pine.LNX.4.64.0601060712540.7293@homer24.u.washington.edu>

On Fri, 6 Jan 2006, casella at stat.ufl.edu wrote:

> hi - in version 2.1 the command
>
> >-2^2
>
> gives
>
> -4
>
> as the answer.  (-2)^2 is evaluated correctly.

So is -2^2.  The precedence of ^ is higher than that of unary minus. It 
may be surprising, but it *is* documented and has been in S for a long 
time.


 	-thomas

Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle



[Rd] Multiplication (PR#8466)
Thomas Lumley