Re: [R] Unable to Plot using headers.

From: stephen's mailinglist account <stephen4mailinglists_at_googlemail.com>
Date: Fri, 27 May 2011 20:39:07 +0100

On 27 May 2011 20:25, Jonathan Daily <biomathjdaily_at_gmail.com> wrote:
> I would caution against using attach(), however, if you are not in an
> interactive session. In functions and scripts, errors can often cause
> the interpreter to exit before the detach(), leaving your data on the
> search path. 99% of all attach/detach cases can be handled by ?with
> and ?within. The issue with attach can be seen in this example:
>
> dat <- data.frame(a = 1, b = 2)
>
> test <- function(x){
> attach(dat)
> if(x) stop("STOP")
> print(a)
> print(b)
> detach(dat)
> }
>
> a
> test(F)
> a
>
> a
> test(T)
> a
>
>
fair point
I tend to opt for the dat$a or dat$b form personally anyway, but was defaulting back to some of the instructional texts I read early on.

-- 
Stephen

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Received on Fri 27 May 2011 - 19:40:40 GMT

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