| axis.POSIXct {base} | R Documentation |
Functions to manipulate objects of classes "POSIXlt" and
"POSIXct" representing calendar dates and times (to the nearest
second).
plot.POSIXct(x, y, xlab = "", ...) plot.POSIXlt(x, y, xlab = "", ...) axis.POSIXct(side, x, format, ...)
x |
A date-time object. |
y |
numeric values to be plotted against x. |
xlab |
a character string giving the label for the x axis. |
side |
See axis. |
format |
See strptime. |
... |
Further arguments to be passed from or to other methods. |
The functions plot against an x-axis of date-times.
axis.POSIXct works quite hard to choose suitable time units
(years, months, days, hours, minutes or seconds) and a sensible
output format, but this can be overridden by supplying a format
specification.
DateTimeClasses for details of the classes.
library(MASS)
data(beav1)
attach(beav1)
time <- strptime(paste(day, time %/% 100, time %% 100),
"%j %H %M")
plot(time, temp, type="l") # axis at 4-hour intervals.
detach("beav1")
plot(.leap.seconds, 1:22, type="n", yaxt="n",
xlab="leap seconds", ylab="")
rug(.leap.seconds)