Message-ID: <tencent_59542F937DC344F6081495A1@qq.com>
Date: 2008-12-19T13:08:00Z
From: Wind
Subject: Slots as @title and @documentation in S-Plus
So R has two kinds of easy methods tag any variable: comment and attr.
I like both of them.
What a great R.
Thanks.
Wind
------------------ ???? ------------------
???: "Robert Sams"<robert at sanctumfi.com>;
????: 2008?12?19?(???) ??7:39
???: "Martin Becker"<martin.becker at mx.uni-saarland.de>; "Wind"<windspeedo at qq.com>;
??: "r-sig-finance"<r-sig-finance at stat.math.ethz.ch>;
??: 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."
>
Robert
-----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."
attr(vMatrix,"title")
(see ?attr for details, especially for the list of "reserved" attribute names).
Martin
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
Germany