extendrange {grDevices} | R Documentation |

## Extend a Numerical Range by a Small Percentage

### Description

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

### 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` |
number specifying the fraction by which the range should be
extended. |

### Value

numeric vector of length 2, “`r`

extended”,
namely simply `r + c(-f,f) * diff(r)`

.

### See Also

`range`

; `pretty`

which can be
considered a sophisticated extension of `extendrange`

.

### Examples

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)))

[Package

*grDevices* version 2.2.1

Index]