# mutatingSlice(at:) Returns a sub-view with the same rank as this view by slicing the dimensions at the provided ranges. ``` @export(implementation) mutating func mutatingSlice(at ranges: [indexRank of any NDArray.RangeExpression]) -> NDArray.MutableRawView ``` ## Parameters `ranges` The range expressions describing where to slice along each dimension. `indexRank` must be ≤ `rank`. Unspecified trailing dimensions are assumed to be `.all`. ## Discussion For example if you have a 3D NDArray and want to increment a specific region, you can slice that region, reintroduce the scalar type, and then access a span over it (or use `withUnsafeMutablePointer` if not contiguous). ```swift /// Updates the desired channel and range of rows func incrementRegion( of mutableRawView: inout NDArray.MutableRawView, channel: Int, startRow: Int, endRow: Int ) { var region = mutableRawView.mutatingSlice(at: [channel, startRow..