---
title: "init(previous:count:transformType:)"
framework: accelerate
role: symbol
role_heading: Initializer
path: "accelerate/vdsp/dct/init(previous:count:transformtype:)"
---

# init(previous:count:transformType:)

Initializes a new discrete cosine transform instance.

## Declaration

```swift
init?(previous: vDSP.DCT? = nil, count: Int, transformType: vDSP.DCTTransformType)
```