[Rd] axis.POSIXct and axis.Date fail for reversed axes
William May
williamcmay at live.com
Fri Aug 19 00:06:36 CEST 2016
When plotting a reversed time axis with the base graphics system, R
fails to label the axes.
Example:
times <- c(Sys.time() - 100, Sys.time())
plot(times, 1:2, xlim = times) # correctly labels the x-axis
plot(times, 1:2, xlim = rev(times)) # fails to label the x-axis
axis.POSIXct(1, times) # still fails to add labels
dates <- c(Sys.Date() - 10, Sys.Date())
plot(dates, 1:2, xlim = dates) # correctly labels the x-axis
plot(dates, 1:2, xlim = rev(dates)) # fails to label the x-axis
axis.Date(1, dates) # still fails to add labels
This is clearly due to the variable keep in both axis functions.
keep <- z >= range[1L] & z <= range[2L]
But if the axis is reversed that should be:
keep <- z <= range[1L] & z >= range[2L]
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