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
ofx
.  f
 number specifying the fraction by which the range should be extended.
Value

A numeric vector of length 2,
r + c(f,f) * diff(r)
.
See Also
range
; pretty
which can be
considered a sophisticated extension of extendrange
.
Examples
library(grDevices)
x < 1:5
(r < range(x)) # 1 5
extendrange(x) # 0.8 5.2
extendrange(x, f= 0.01) # 0.96 5.04
## Use 'r' if you have it already:
stopifnot(identical(extendrange(r = r),
extendrange(x)))
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