[R] Can't format x axis on a stacked plot of a zoo object

[Jose Iparraguirre]

Hi,

Have a look at this example in plot.zoo:

## Custom x axis labelling using a custom panel.
# 1. test data
z <- zoo(c(21, 34, 33, 41, 39, 38, 37, 28, 33, 40), 
     as.Date(c("1992-01-10", "1992-01-17", "1992-01-24", "1992-01-31", 
       "1992-02-07", "1992-02-14", "1992-02-21", "1992-02-28", "1992-03-06", 
       "1992-03-13")))
zz <- merge(a = z, b = z+10)
# 2. axis tick for every point. Also every 3rd point labelled.
my.panel <- function(x, y, ..., pf = parent.frame()) {
   fmt <- "%b-%d" # format for axis labels
   lines(x, y, ...)
   # if bottom panel
   if (with(pf, length(panel.number) == 0 || 
        panel.number %% nr == 0 || panel.number == nser)) { 
      # create ticks at x values and then label every third tick
      axis(side = 1, at = x, labels = FALSE)
      ix <- seq(1, length(x), 3)
      labs <- format(x, fmt)
      axis(side = 1, at = x[ix], labels = labs[ix], tcl = -0.7, cex.axis = 0.7)
   }
}
# 3. plot
plot(zz, panel = my.panel, xaxt = "n")


Regards,

Jose


________________________________________
From: r-help-bounces at r-project.org [r-help-bounces at r-project.org] On Behalf Of Vindoggy ! [vindoggy at hotmail.com]
Sent: 13 November 2012 22:30
To: r-help at r-project.org
Subject: [R] Can't format x axis on a stacked plot of a zoo object

As an example data set:

set.seed(1)
z.Date <- as.Date(paste(2003, 02, c(1, 3, 7, 9, 14), sep = "-"))
z <- zoo(cbind(left = rnorm(5), right = rnorm(5, sd = 0.2)), z.Date)

tt<-time(z)



fmt<-"%b-%d"

labs<-format(tt,fmt)
plot(z[,1], xlab = "Time", ylab = "")

If I plot the data and don't like the format of the x axis I can do this:

plot(z[,1], xlab = "Time", ylab = "",xaxt="n")

axis(side=1, at=tt[1:5],labels=labs[1:5],cex.axis=0.7)

But if I want to do a stacked plot:

plot(z, xlab = "Time", ylab = "",xaxt="n")
axis(side=1, at=tt[1:5],labels=labs[1:5],cex.axis=0.7)



The axis command has no effect. Can someone explain what is going on and how to format a stacked plot like this?


Thanks
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