[R] FW: Unable to Plot using headers.

[Bert Gunter]

Are Date and Qty numeric? Check.

-- Bert

On Fri, May 27, 2011 at 1:43 PM, Struckmeier, Nathanael
<NStruckmeier at harryanddavid.com> wrote:
>
> -----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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>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
"Men by nature long to get on to the ultimate truths, and will often
be impatient with elementary studies or fight shy of them. If it were
possible to reach the ultimate truths without the elementary studies
usually prefixed to them, these would not be preparatory studies but
superfluous diversions."

-- Maimonides (1135-1204)

Bert Gunter
Genentech Nonclinical Biostatistics