extendrange

Extend a Numerical Range by a Small Percentage

Extends a numerical range by a small percentage, i.e., fraction, on both sides.

Keywords
dplot
Usage
extendrange(x, r = range(x, na.rm = TRUE), f = 0.05)
Arguments
x

numeric vector; not used if r is specified.

r

numeric vector of length 2; defaults to the range of x.

f

positive number(s) specifying the fraction by which the range should be extended. If longer than one, f[1] is used on the left, and f[2] on the right.

Value

A numeric vector of length 2, r + c(-f1,f2) * diff(r), where f1 is f[1] and f2 is f[2] or f if it is of length one.

See Also

range; pretty which can be considered a sophisticated extension of extendrange.

Aliases
  • extendrange
Examples
library(grDevices) # NOT RUN { x <- 1:5 (r <- range(x)) # 1 5 extendrange(x) # 0.8 5.2 extendrange(x, f= 0.01) # 0.96 5.04 ## extend more to the right: extendrange(x, f=c(.01,.03)) # 0.96 5.12 ## Use 'r' if you have it already: stopifnot(identical(extendrange(r = r), extendrange(x))) # }
Documentation reproduced from package grDevices, version 3.6.1, License: Part of R 3.6.1

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