Expand a data range by a c(mul, add) specification

Returns c(lo - mul*span - add, hi + mul*span + add) where span = diff(r). Used to introduce a small "breath" around the data so points are not crammed against the panel edge.

Usage

.expand_limits(r, expand = c(0, 0))

Arguments

r

Length-2 numeric vector (the data range).

expand

Length-1 or length-2 numeric. Scalars become c(mul, 0).

Value

Length-2 numeric vector.