# vDSP_ctoz Copies the contents of an interleaved single-precision complex vector to a split complex vector. ``` extern void vDSP_ctoz(const DSPComplex *__C, vDSP_Stride __IC, const DSPSplitComplex *__Z, vDSP_Stride __IZ, vDSP_Length __N); ``` ## Parameters `__C` The interleaved-complex input vector. `__IC` The distance between the real elements in the input vector. For example, a stride of `2` corresponds to a single complex element. `__Z` The split-complex output vector. `__IZ` The distance between the elements in the ouput vector. `__N` The number of complex elements that the function processes. ## Discussion For example, the following code converts the contents of an array of [`DSPComplex`](/documentation/Accelerate/DSPComplex) structures to a [`DSPSplitComplex`](/documentation/Accelerate/DSPSplitComplex) structure: ```swift let source: [DSPComplex] = [ DSPComplex(real: 1.0, imag: 10.0), DSPComplex(real: 2.0, imag: 20.0), DSPComplex(real: 3.0, imag: 30.0), DSPComplex(real: 4.0, imag: 40.0), ] let destReal = UnsafeMutableBufferPointer.allocate(capacity: 4) let destImag = UnsafeMutableBufferPointer.allocate(capacity: 4) var destination = DSPSplitComplex(realp: destReal.baseAddress!, imagp: destImag.baseAddress!) vDSP_ctoz(source, 2, &destination, 1, 4) print(Array(destReal)) // Prints "[1.0, 2.0, 3.0, 4.0]". print(Array(destImag)) // Prints "[10.0, 20.0, 30.0, 40.0]". ``` --- Copyright © 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)