Method returning the range of step sizes in an object; i.e., the Range of
differences between successive sorted values. In particular the wavelength
step sizes [\(nm\)] of objects of class `generic_spct`

or derived (or
the step sizes of values in a `numeric`

vector).

## Usage

```
wl_stepsize(x, ...)
stepsize(x, ...)
# Default S3 method
stepsize(x, ...)
# S3 method for class 'numeric'
stepsize(x, ...)
# S3 method for class 'generic_spct'
stepsize(x, ...)
# S3 method for class 'generic_mspct'
stepsize(x, ..., idx = "spct.idx")
```

## Methods (by class)

`stepsize(default)`

: Default function usable on numeric vectors.`stepsize(numeric)`

: Method for numeric vectors.`stepsize(generic_spct)`

: Method for "generic_spct" objects.`stepsize(generic_mspct)`

: Method for "generic_mspct" objects.

## See also

Other wavelength summaries:
`wl_midpoint()`

,
`wl_min()`

,
`wl_range()`