The input `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.

```
normalize01(x, ...)
# S4 method for matrix
normalize01(x, tolerance = hy_get_option("tolerance"))
# S4 method for numeric
normalize01(x, tolerance = hy_get_option("tolerance"))
# S4 method for hyperSpec
normalize01(x, ...)
```

## Arguments

- x
Object (e.g., vector) with values to transform.

- ...
additional parameters such as `tolerance`

handed down.

- tolerance
Tolerance level for determining what is 0 and 1.

## Value

object (e.g., vector) with `x`

values mapped to the interval [0, 1].