[R] time plotting problem
John Kane
jrkrideau at yahoo.ca
Tue Nov 13 01:20:29 CET 2007
Thanks to Gabor and Jim. I am not sure if the first
entry year = 2009 is all the problem I'm getting but
it is certainly seems like the worst of it.
My stupidity: Someone sent me the data set in Excel
and I didn't do the basic data checks on. I _KNEW_ the
data went from 2006 to 2007.
--- Gabor Grothendieck <ggrothendieck at gmail.com>
wrote:
> In your examples the first line of your data refers
> to the
> year 2009 and Oct 1st is repeated. Is that really
> what
> you meant?
>
> I can't tell what your problem is from your
> description
> other than the data problems cited but there are
> lots of
> examples of plotting with zoo in the following which
> may
> help you:
> vignette("zoo")
> vignette("zoo-quickref")
> ?plot.zoo
> ?xyplot.zoo
>
> Note that zoo series must be time series, i.e. they
> must
> have unique times.
>
> On Nov 12, 2007 1:47 PM, John Kane
> <jrkrideau at yahoo.ca> wrote:
> > I am completely misunderstanding how to handle
> dates.
> > I want to plot a couple of data series against
> some
> > dates. Simple example 1 below works fine.
> > Unfortunately I have multiple observations per day
> (no
> > time breakdowns) and observations across years.
> > (example 2 very simplistic version )
> >
> > Can anyone suggest a quick fix or point me to
> > something to read? I thought that zoo might do it
> but
> > I seem to be missing something there too.
> >
> > Any suggestions gratefully recieved.
> >
> >
> > Example 1 consecutive dates same year.
> > =================================================
> > x <- "days
> > 9/26/09
> > 9/27/06
> > 9/28/06
> > 9/29/06
> > 9/29/06
> > 9/29/06
> > 10/1/06
> > 10/1/06
> > 10/2/06
> > 10/3/06"
> >
> > mydata <- read.table(textConnection(x),
> header=TRUE,
> > as.is=TRUE); mydata
> >
> > mydates <- as.Date(mydata[,1], "%m/%d/%y");
> mydates
> > mynums <- rnorm(10)
> > plot(mydates, mynums)
> > ================================================
> > Example 2 (things go blooy!)
> > non-consecutive dates different years.
> >
> > =================================================
> > x <- "days
> > 9/26/09
> > 9/27/06
> > 9/28/06
> > 9/29/06
> > 9/29/06
> > 9/29/06
> > 10/1/07 # <- year changes
> > 10/1/07
> > 10/2/07
> > 10/3/07"
> >
> > mydata <- read.table(textConnection(x),
> header=TRUE,
> > as.is=TRUE); mydata
> >
> > mydates <- as.Date(mydata[,1], "%m/%d/%y");
> mydates
> > mynums <- rnorm(10)
> > plot(mydates, mynums)
> >
> > ______________________________________________
> > 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.
> >
>
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