Time on x-axis

===== Original Message From "Gabor Grothendieck" <ggrothendieck at gmail.com> 

Try this:

# test data
tt <- c("23:05:02", "23:10:02", "23:15:03", "23:20:03", "23:25:03",
"23:30:03", "23:35:03", "23:40:03", "23:45:04", "23:50:04", "23:55:03",
"23:55:03")
x <- c(0.575764, 0.738379, 0.567414, 0.663436, 0.599834, 0.679571,
0.88141, 0.868848, 0.969271, 0.878968, 0.990972, 0.990972)

library(zoo)
library(chron)
z <- zoo(x, times(tt))
plot(z)

Read the R Help Desk article in R News 4/1 about dates and times
and also read the chron article in its references.

Also read the zoo vignette which you can access like this:

library(zoo)
vignette("zoo")

and also read ?axis in case you want to customize the axes.


On 2/20/06, Sangeetha Swaminathan <sangi at itc.utk.edu> wrote:

Hello,

  I just started using the GNU R. I am having trouble plotting my data. I 

tryin to plot the following data:

TIMESTAMP    LOGIN-TIME
(hh:mm:ss)          (s)

23:55:03       0.990972
23:55:03       0.990972
23:50:04       0.878968
23:45:04       0.969271
23:40:03       0.868848
23:35:03        0.88141
23:30:03       0.679571
23:25:03       0.599834
23:20:03       0.663436
23:15:03       0.567414
23:10:02       0.738379
23:05:02       0.575764

with TIMESTAMP on the x-axis. The plot() function assumes the x-axis as the
total number of events, and plots the desired graph. But I want the 

on the x-axis. If I try to change the x-axis, the y-axis gets modified too,
and all I get is just a "dot" as a plot.
Can someone tell me how I can make R plot my graph, with TIMESTAMP as my
x-axis and LOGIN_TIME as my y-axis?

Thank you.

Sangeetha

-- Sangeetha Swaminathan
Graduate Assistant
Innovative Technology Center (ITC)
2444 Dunford Hall
The University of Tennessee
Knoxville, TN 37996
Phone [O]:(865) 974-9672
     [R]:(865) 946-4340