[R-SIG-Finance] Slots as @title and @documentation in S-Plus

Wind windspeedo at qq.com
Fri Dec 19 14:08:00 CET 2008

So R has two kinds of easy methods tag any variable: comment and attr.
I like both of them.
What a great R.

------------------ 原始邮件 ------------------
发件人: "Robert Sams"<robert at sanctumfi.com>;
发送时间: 2008年12月19日(星期五) 晚上7:39
收件人: "Martin Becker"<martin.becker at mx.uni-saarland.de>; "Wind"<windspeedo at qq.com>; 
抄送: "r-sig-finance"<r-sig-finance at stat.math.ethz.ch>; 
主题: RE: [R-SIG-Finance] Slots as @title and @documentation in S-Plus

Also see ?comment

> vMatrix <- matrix(1:10, ncol=2)
> comment(vMatrix) <- "The first time and so on."
> comment(vMatrix)
[1] "The first time and so on."


-----Original Message-----
From: r-sig-finance-bounces at stat.math.ethz.ch [mailto:r-sig-finance-bounces at stat.math.ethz.ch] On Behalf Of Martin Becker
Sent: 19 December 2008 08:02
To: Wind
Cc: r-sig-finance
Subject: Re: [R-SIG-Finance] Slots as @title and @documentation in S-Plus

You may use attributes, e.g.

attr(vMatrix,"title") <- "The first time and so on."

(see ?attr for details, especially for the list of "reserved" attribute names).


Wind wrote:
> In S-Plus, data frames have slots as @title and @documentation.  It seems that R is different.
> After the following code:
> vMatrix<-sqlQuery(sqlMatrix,sqlStr1)
> If I want to add some memo to vMatrix,it would be vMatrix at title="The first time and so on." in S-Plus.
> But in R, data frame has no slots.
> According to help and documentations, it seems that S4 class has slot. But data frame is not S4.   The S4/S3 confused me since I am new to R.
> I wonder whether thers's easy way to attach some memo to a data frame, as in S-Plus.
> Thanks.
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Dr. Martin Becker
Statistics and Econometrics
Saarland University
Campus C3 1, Room 206
66123 Saarbruecken

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