From jmc at r-project.org  Wed May  7 18:16:18 2014
From: jmc at r-project.org (John Chambers)
Date: Wed, 07 May 2014 09:16:18 -0700
Subject: [Rd] precedence (was 'historical NA question')
In-Reply-To: <3dfcdc$gnkvcv@ironport9.mayo.edu>
References: <3dfcdc$gnkvcv@ironport9.mayo.edu>
Message-ID: <536A5C52.4030907@r-project.org>

On 5/7/14, 5:21 AM, Therneau, Terry M., Ph.D. wrote:
> Hadley asked about the Blue book; my shelf still has the earlier brown book
>     Becker and Chambers, 1984, S: An interactive environment for data
> analysis and graphics.

Historically interesting, but there was never a guarantee that Version 3 
of S (the "blue book") was back-compatible with earlier versions.  We 
gave users some help in "getting on the road" to converting, that was 
all (see Appendix 4 to the blue book).

For that one brief moment, we felt free to innovate.

John

>
> The manual page for precedence is
>
> $               component select
> %x              special operator
> -               unary minus
> :               sequence operator
> ^ **            exponentiation
> * /             mult/div
> + -             add/sub
> < > <= >= == != logical
> !               not
> & |             and/or
> <- ->           assignment
>
> Terry Therneau
>
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[Rd] precedence (was 'historical NA question')
John Chambers