---
title: "mutatingSlice(at:)"
framework: coreai
role: symbol
role_heading: Instance Method
path: "coreai/ndarray/mutablerawview/mutatingslice(at:)-5ts4w"
---

# mutatingSlice(at:)

Returns a sub-view with the same rank as this view by slicing the dimensions at the provided ranges.

## Declaration

```swift
@export(implementation) mutating func mutatingSlice(at ranges: [any NDArray.RangeExpression]) -> NDArray.MutableRawView
```

## 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

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). /// 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..<endRow, .all]).view(as: Float.self)   var mutableSpan = region.contiguousElements! // contiguous region expected in this case

for i in mutableSpan.indices {     mutableSpan[i] += 1   } }