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)