[R] Stacked barplot of timeseries data

[Achim Zeileis]

On Tue, 3 Jun 2008, Demetri S. Mouratis wrote:

> Hi,
>
> I'm trying to plot time-series data where each sample breaks down the 
> percentage of CPU time spent in each of four states (usr, nice, sys, idle)
>
>
> 19:08:15  %usr  %nice   %sys   %idle
> 19:08:16    5      0     10     86
> 19:08:17   17      0     14     69
> 19:08:18    5      0      8     87
> 19:08:19   10      0     10     81
> 19:08:20    3      0      7     90
> 19:08:21    4      0      8     88
> [on and on for many samples]
>
> The plot I'm aiming for would stack the first three states in a colored 
> barplot, so you get a visual sense of how busy the system is over the course 
> of the day, and which state the CPU is spending its time in.  (I've done this 
> as area charts as well).
>
> barplot() looked promising, but it wants to stack the columns instead of the 
> rows.
>
> Anybody have a good solution for this?

The "zoo" package provides a barplot() method for "zoo" series.

Example with some artificial data:

   library("zoo")
   x <- matrix(runif(44), ncol = 4)
   colnames(x) <- c("%usr", "%nice", "%sys", "%idle")
   z <- zoo(x, Sys.time() - c(10:0))
   barplot(z, legend = TRUE)

hth,
Z

> Thanks!
> ...Demetri
>
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