[R] FW: Unable to Plot using headers.

[Struckmeier, Nathanael]

-----Original Message-----
From: Struckmeier, Nathanael 
Sent: Friday, May 27, 2011 1:39 PM
To: 'stephen's mailinglist account'
Subject: RE: [R] Unable to Plot using headers.

Thanks for the input. Despite both graphing directly and with "attach" I
am still getting a screwed up graphical output as well as an error. 

My table is object "demand" w/ columns Date and Qty
Plot(demand$Qty, demand$Date)

Attach(demand)
Plot(Qty, Date) 

Both of these commands produce something completely different (and quite
odd) from a simple xy scatter. X-axis should be "date" and Y-axis should
be "Qty". The table "demand" was imported into R sorted by date. Upon
graphing, the X-axis displays dates but they are out of order and the
graph is a black box...  




-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of stephen's mailinglist account
Sent: Friday, May 27, 2011 12:39 PM
To: Jonathan Daily
Cc: R-help at r-project.org
Subject: Re: [R] Unable to Plot using headers.

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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