# slice(at:) Returns a sub-view with the same rank as this view by slicing the dimensions at the provided ranges. ``` @export(implementation) func slice(at ranges: [any NDArray.RangeExpression]) -> NDArray.View ``` ## Parameters `ranges` The range expressions describing where to slice along each dimension. `ranges.count` must be ≤ `rank`. Unspecified trailing dimensions are assumed to be `.all`. ## Discussion For example if you have a 2D NDArray and want to compute the sum of a specific row, you can slice that row and then access a span over it (or use `withUnsafePointer` if not contiguous). ```swift /// Returns the sum of the given row. func sumOfRow( of view: borrowing NDArray.View, row: Int ) -> Float { let rowSlice = view.slice(at: [row]) let elements = rowSlice.contiguousElements! // contiguous row expected in this case var sum: Float = 0 for i in elements.indices { sum += elements[i] } return sum } ``` --- 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)