On May 27, 2011, at 5:06 PM, Struckmeier, Nathanael wrote:
I tried command
as.numeric(Qty) #converting column"Qty" in object "demand" to
numeric. However it remains a non-numeric value.
Right. You didn't assign it to anything. AND since you are apparently
following the IMO misguided advice to use these as attach()-ed
variables, even if you did make a change ,,,, it would be lost as soon
as you detached it. You really do need to read the "Introduction to R"
and work through the examples. Asking question like this on r-help is
slowing your progress.
What is the best way to convert a column of data to a numeric value in
R?
It depends on what it might be. Pay attention to the use of str() as
you do your reading and "homework".
What is the best way to convert dates into a numeric format (or some
format able to be used in an x,y scatter) while still maintaining its
inherent "date" property?
It depends on what they really are. Are they just characters or are
they one of hte several DateTime classes? Again... back to the books.
StatBat2
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org
]
On Behalf Of Struckmeier, Nathanael
Sent: Friday, May 27, 2011 1:57 PM
To: Bert Gunter
Cc: R-help@r-project.org
Subject: Re: [R] FW: Unable to Plot using headers.
is.numeric(demand)
[1] FALSE
is.numeric(Qty)
[1] FALSE
is.numeric(Date)
[1] FALSE
Doesn't look like they are numeric. I'll try and convert them and
check
back if I have problems. Thanks Gunter!
Thank You
Nathan Struckmeier
Supply Chain Planning
Office 541-864-5029
nstruckme...@harryanddavid.com
2500 S. Pacific Hwy, Medford OR, 97501
Daily Humor: Chuck Norris can slam a revolving door....
-----Original Message-----
From: Bert Gunter [mailto:gunter.ber...@gene.com]
Sent: Friday, May 27, 2011 1:47 PM
To: Struckmeier, Nathanael
Cc: R-help@r-project.org
Subject: Re: [R] FW: Unable to Plot using headers.
Are Date and Qty numeric? Check.
-- Bert
On Fri, May 27, 2011 at 1:43 PM, Struckmeier, Nathanael
<nstruckme...@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-boun...@r-project.org
[mailto:r-help-boun...@r-project.org]
On Behalf Of stephen's mailinglist account
Sent: Friday, May 27, 2011 12:39 PM
To: Jonathan Daily
Cc: R-help@r-project.org
Subject: Re: [R] Unable to Plot using headers.
On 27 May 2011 20:25, Jonathan Daily <biomathjda...@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@r-project.org mailing list
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PLEASE do read the posting guide
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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
______________________________________________
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PLEASE do read the posting guide
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and provide commented, minimal, self-contained, reproducible code.
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
______________________________________________
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