A utility function for use in creating glyphs for variables, designed for the penguinglyphs package.
Usage
normalize_var(x, new_min = 0.5, new_max = 1.5, from = NULL)
Arguments
- x
Numeric vector to normalize
- new_min
New minimum value (default 0.5)
- new_max
New maximum value (default 1.5)
- from
Range of values mapped onto [new_min, new_max]. The default, NULL,
uses the range of x. Supply a fixed range to scale different subsets of a
dataset consistently; values of x outside it are extrapolated.
Value
Normalized numeric vector with values scaled to [new_min, new_max].
Missing values remain NA.
Examples
normalize_var(c(1, 2, 3, 4, 5))
#> [1] 0.50 0.75 1.00 1.25 1.50
normalize_var(c(10, 20, 30), new_min = 0, new_max = 1)
#> [1] 0.0 0.5 1.0
# the same values, scaled relative to a wider range
normalize_var(c(10, 20, 30), new_min = 0, new_max = 1, from = c(0, 100))
#> [1] 0.1 0.2 0.3
