---
title: "init(concatenating:alongAxis:)"
framework: coreml
role: symbol
role_heading: Initializer
path: "coreml/mlshapedarrayslice/init(concatenating:alongaxis:)"
---

# init(concatenating:alongAxis:)

Merges a sequence of shaped arrays into one shaped array along an axis.

## Declaration

```swift
init<S>(concatenating shapedArrays: S, alongAxis: Int) where Scalar == S.Element.Scalar, S : Sequence, S.Element : MLShapedArrayProtocol
```

## Parameters

- `shapedArrays`: A sequence of shaped arrays.
- `alongAxis`: A zero-based axis number the shaped arrays in multiArray merge along. tip: Select the shaped array’s highest dimension by passing a negative axis number. For example, an axis value of -1 or -2 selects the last or second-to-last dimension, respectively.

## Discussion

Discussion All shaped arrays in the sequence must have the following: The same underlying data type The same number of dimensions The same size for each corresponding dimension, except for the concatenation axis For example, this code concatenates two shaped arrays along their second dimension: // A 2x3 shaped array. // 0 1 2 // 5 6 7 let shapedArray1 = MLShapedArray<Int32>(scalars: [0, 1, 2, 5, 6, 7],                                         shape: [2, 3])

// A 2x2 shaped array. // 3 4 // 8 9 let shapedArray2 = MLShapedArray<Int32>(scalars: [3, 4, 8, 9],                                         shape: [2, 2])

// A 2x5 shaped array. // 0 1 2 3 4 // 5 6 7 8 9 let shapedArray3 = MLShapedArray(concatenating: [shapedArray1,shapedArray2],                                  alongAxis: 1)

## See Also

### Creating a shaped array slice from another type

- [init(_:)](coreml/mlshapedarrayslice/init(_:).md)