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

[Robert Sams]

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