<!--
{
  "availability" : [
    "iOS: 15.0.0 -",
    "iPadOS: 15.0.0 -",
    "macCatalyst: -",
    "macOS: 12.0.0 -",
    "tvOS: 15.0.0 -",
    "visionOS: -",
    "watchOS: 8.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Accelerate",
  "identifier" : "/documentation/Accelerate/vDSP/DiscreteFourierTransform/transform(input:output:)-1tsod",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "Accelerate"
    ],
    "preciseIdentifier" : "s:10Accelerate4vDSPO24DiscreteFourierTransformCAASo16DSPDoubleComplexVRszrlE9transform5input6outputyqd___qd_0_ztAA0A6BufferRd__AA0a7MutableK0Rd_0_AG7ElementRtd__AgMRtd_0_r0_lF"
  },
  "title" : "transform(input:output:)"
}
-->

# transform(input:output:)

Computes a double-precision discrete Fourier transform.

```
func transform<U, V>(input: U, output: inout V) where U : AccelerateBuffer, V : AccelerateMutableBuffer, U.Element == DSPDoubleComplex, V.Element == DSPDoubleComplex
```

## Parameters

`input`

An array of [`DSPDoubleComplex`](/documentation/Accelerate/DSPDoubleComplex) structures that contains the input.

`output`

An array of [`DSPDoubleComplex`](/documentation/Accelerate/DSPDoubleComplex) structures that contains the output.

---

Copyright &copy; 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)