axTicks.POSIXct | R Documentation |
Compute pretty tickmark locations, the same way as R does internally. By default, gives the at values which axis.POSIXct(side, x) would use.
axTicks.POSIXct(side, x, at, format, labels = TRUE, ...) axTicks.Date(side = 1, x, ...)
side |
See axis. |
x, at |
A date-time or date object. |
format |
See strptime. |
labels |
Either a logical value specifying whether annotations are to be made at the tickmarks, or a vector of character strings to be placed at the tickpoints. |
... |
Further arguments to be passed from or to other methods. |
axTicks has no implementation for POSIXct axis. This function fills the gap.
numeric vector of coordinate values at which axis tickmarks can be drawn.
Andri Signorell <andri@signorell.net> simply copying R-Core code
axTicks
, axis.POSIXct
with(beaver1, { time <- strptime(paste(1990, day, time %/% 100, time %% 100), "%Y %j %H %M") plot(time, temp, type = "l") # axis at 4-hour intervals. # now label every hour on the time axis plot(time, temp, type = "l", xaxt = "n") r <- as.POSIXct(round(range(time), "hours")) axis.POSIXct(1, at = seq(r[1], r[2], by = "hour"), format = "%H") # place the grid abline(v=axTicks.POSIXct(1, at = seq(r[1], r[2], by = "hour"), format = "%H"), col="grey", lty="dotted") })
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