x is mapped to [0, 1] by subtracting the minimum and
subsequently dividing by the maximum. If all elements of
x are equal,
1 is returned.
Object (e.g., vector) with values to transform.
additional parameters such as
tolerance handed down.
Tolerance level for determining what is 0 and 1.
object (e.g., vector) with
x values mapped to the interval [0, 1].