pretty.Date

Pretty Breakpoints for Date-Time Classes

Compute a sequence of about n+1 equally spaced ‘nice’ values which cover the range of the values in x, possibly of length one, when min.n = 0 and there is only one unique x.

Keywords
dplot
Usage
# S3 method for Date
pretty(x, n = 5, min.n = n %/% 2, sep = " ", …)
# S3 method for POSIXt
pretty(x, n = 5, min.n = n %/% 2, sep = " ", …)
Arguments
x

an object of class "Date" or "POSIXt" (i.e., "POSIXct" or "POSIXlt").

n

integer giving the desired number of intervals.

min.n

nonnegative integer giving the minimal number of intervals.

sep

character string, serving as a separator for certain formats (e.g., between month and year).

further arguments for compatibility with the generic, ignored.

Value

A vector (of the suitable class) of locations, with attribute "labels" giving corresponding formatted character labels.

See Also

pretty for the default method.

Aliases
  • pretty.Date
  • pretty.POSIXt
Examples
library(grDevices) # NOT RUN { <!-- % time-dependent --> pretty(Sys.Date()) pretty(Sys.time(), n = 10) # } # NOT RUN { pretty(as.Date("2000-03-01")) # R 1.0.0 came in a leap year ## time ranges in diverse scales:% also in ../../../../tests/reg-tests-1c.R require(stats) steps <- setNames(, c("10 secs", "1 min", "5 mins", "30 mins", "6 hours", "12 hours", "1 DSTday", "2 weeks", "1 month", "6 months", "1 year", "10 years", "50 years", "1000 years")) x <- as.POSIXct("2002-02-02 02:02") lapply(steps, function(s) { at <- pretty(seq(x, by = s, length = 2), n = 5) attr(at, "labels") }) # }
Documentation reproduced from package grDevices, version 3.6.0, License: Part of R 3.6.0

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