[R] plotting time series with zoo pckg

[Gabor Grothendieck]

Try this:


# test data
library(zoo)
z <- structure(c(21, 34, 33, 41, 39, 38, 37, 28, 33, 40),
     index = structure(c(8044, 8051, 8058, 8065, 8072, 8079, 8086,
     8093, 8100, 8107), class = "Date"), class = "zoo")
z

# plot without X axis
plot(z, xaxt = "n")

# unlabelled tick at each point
axis(1, time(z), lab = FALSE)

# labelled tick every third point
dd <- time(z)[seq(1, length(z), 3)]
axis(1, dd, as.character(dd), cex.axis = 0.7, tcl = -0.7)



On 12/26/06, ahmad ajakh <aajakh at yahoo.com> wrote:
> Hi all,
>
> I am using the zoo package to plot time series. I have a problem with formatting the axes.
> my zoo object (z) looks like the following.
>
>                c1
> 1992-01-10     21
> 1992-01-17     34
> 1992-01-24     33
> 1992-01-31     41
> 1992-02-07     39
> 1992-02-14     38
> 1992-02-21     37
> 1992-02-28     28
> 1992-03-06     33
> 1992-03-13     40
>
> plot.zoo(z) produces a plot with the labels on the x-axis that I cannot control.
> I want a an xtick every 10 data points with corresponding date labels.
> I have tried different combination of axis command without success
> any idea?
> Thanks
>
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