# positionRange(forY:) Returns the range of y position for the given data value, or `nil` if the x scale is unavailable or if the value is invalid. The returned position range is relative to the plot. ``` func positionRange

(forY value: P) -> ClosedRange? where P : Plottable ``` ## Parameters `value` The data value. ## Return Value The position range corresponding to the data value. ## 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. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)