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

(forY value: P) -> CGFloat? where P : Plottable ``` ## Parameters `value` A data value. ## Return Value The position corresponding to the data value. --- 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)