[R] Plotting monthly timeseries with an x-axis in "time format"

[vittorio]

Unfortunately something doesn't work:
> tab <- ts(cbind(A = c(79.47, 89.13, 84.86, 75.68, 72.82, 78.87, 93.46,
+ 78.18, 82.46, 77.25, 80.95, 84.39, 81.7, 74.76, 65.29, 60.3,
+ 66.59, 73.19, 92.39, 65.76, 77.45, 74.22, 101.36, 100.01), B = c(77.95,
+ 76.73, 51.2, 51.86, 51.29, 49.45, 53.88, 47.96, 55.07, 45.34,
+ 37.07, 37.53, 47.79, 37.5, 30.35, 37.78, 34.13, 39.14, 39.89,
+ 35.46, 36.54, 38.39, 47.33, 45.34)), start = c(2006, 1), freq = 12)
>
> library(zoo)
> pnl.xaxis <- function(...) {
+      lines(...)
Error: unexpected input in:
"pnl.xaxis <- function(...) {
 "

What's wrong with it?
Ciao Vittorio



Il Monday 03 December 2007 20:40:16 Gabor Grothendieck ha scritto:
> This can be done with plot.zoo and a panel function:
>
> tab <- ts(cbind(A = c(79.47, 89.13, 84.86, 75.68, 72.82, 78.87, 93.46,
> 78.18, 82.46, 77.25, 80.95, 84.39, 81.7, 74.76, 65.29, 60.3,
> 66.59, 73.19, 92.39, 65.76, 77.45, 74.22, 101.36, 100.01), B = c(77.95,
> 76.73, 51.2, 51.86, 51.29, 49.45, 53.88, 47.96, 55.07, 45.34,
> 37.07, 37.53, 47.79, 37.5, 30.35, 37.78, 34.13, 39.14, 39.89,
> 35.46, 36.54, 38.39, 47.33, 45.34)), start = c(2006, 1), freq = 12)
>
> library(zoo)
> pnl.xaxis <- function(...) {
>      lines(...)
>      panel.number <- parent.frame()$panel.number
>      nser <- parent.frame()$nser
>      # if bottom panel
>      if (!length(panel.number) || panel.number == nser) {
>            tt <- list(...)[[1]]
>            ym <- as.yearmon(tt)
>            mon <- as.numeric(format(ym, "%m"))
>            yy <- format(ym, "%y")
>            mm <- substring(month.abb[mon], 1, 1)
>            axis(1, tt[mon == 1], yy[mon == 1], cex.axis = 0.7)
>            axis(1, tt[mon > 1], mm[mon > 1], cex.axis = 0.5, tcl = -0.3)
>      }
> }
> plot(as.zoo(tab), panel = pnl.xaxis, xaxt = "n")
>
> On Dec 3, 2007 12:11 PM, vittorio <vdemart1 at tin.it> wrote:
> > I have the following timeseries "tab"
> > =====================================
> >
> > > str(tab)
> >
> >  mts [1:23, 1:2] 79.5 89.1 84.9 75.7 72.8 ...
> >  - attr(*, "dimnames")=List of 2
> >  ..$ : NULL
> >  ..$ : chr [1:2] "Ipex...I" "Omel...E"
> >  - attr(*, "tsp")= num [1:3] 2006 2008   12
> >  - attr(*, "class")= chr [1:2] "mts" "ts"
> >
> > > tab
> >
> >         Ipex...I Omel...E
> > Jan 2006    79.47    77.95
> > Feb 2006    89.13    76.73
> > Mar 2006    84.86    51.20
> > Apr 2006    75.68    51.86
> > May 2006    72.82    51.29
> > Jun 2006    78.87    49.45
> > Jul 2006    93.46    53.88
> > Aug 2006    78.18    47.96
> > Sep 2006    82.46    55.07
> > Oct 2006    77.25    45.34
> > Nov 2006    80.95    37.07
> > Dec 2006    84.39    37.53
> > Jan 2007    81.70    47.79
> > Feb 2007    74.76    37.50
> > Mar 2007    65.29    30.35
> > Apr 2007    60.30    37.78
> > May 2007    66.59    34.13
> > Jun 2007    73.19    39.14
> > Jul 2007    92.39    39.89
> > Aug 2007    65.76    35.46
> > Sep 2007    77.45    36.54
> > Oct 2007    74.22    38.39
> > Nov 2007   101.36    47.33
> > Dec 2007   100.01  45.34
> > ===============================
> >
> > Plotting tab with a simple "plot(tab,plot.type="single")" I'm obtaining a
> > graph  with the x axis in an orrible decimal format so that,e.g., Jan
> > 2006 is 2006.0 and Nov 2006 is 2006.8(33)!
> >
> >  Instead I would like to see the x-axis in a more human-readable format,
> > for instance, 12 tics for each year and a label at the beginning of each
> > quarter of the year: 2006.1, 2006.4,2006.7.
> >  - OR -
> > more elegantly, I would like to have the 12 tics with the month shortened
> > labels: Jan, Feb, etc. and below, say June, one label for the year.
> >
> > Please help.
> >
> > Ciao
> > Vittorio
> >
> > ______________________________________________
> > 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.