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# positionRange(for:)

Returns the range of x and y positions for the given pair of data values, or `nil` if the y scale is unavailable
or if the value is invalid.

```
func positionRange<X, Y>(for point: (x: X, y: Y)) -> CGRect? where X : Plottable, Y : Plottable
```

## Return Value

The position range corresponding to the data values.

## Discussion

For a continuous data value, the returned range is a single point. For a categorical data value, the returned
range is the range of positions that correspond to the given category.

---

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