vDSP_ztocD

Declaration

extern void vDSP_ztocD(const DSPDoubleSplitComplex *__Z, vDSP_Stride __IZ, DSPDoubleComplex *__C, vDSP_Stride __IC, vDSP_Length __N);

Parameters

• __Z:

  The split-complex input vector.

• __IZ:

  The distance between the elements in the input vector.

• __C:

  The interleaved-complex output vector.

• __IC:

  The distance between the real elements in the output vector. For example, a stride of 2 corresponds to a single complex element.

• __N:

  The number of complex elements that the function processes.

Discussion

For example, the following code converts the contents of a DSPDoubleSplitComplex structure to an array of DSPDoubleComplex structures :

    let srcReal = UnsafeMutableBufferPointer<Double>.allocate(capacity: 4)
    _ = srcReal.initialize(from: [1.0, 2.0, 3.0, 4.0])
    
    let srcImag = UnsafeMutableBufferPointer<Double>.allocate(capacity: 4)
    _ = srcImag.initialize(from: [10.0, 20.0, 30.0, 40.0])
    
    var source = DSPDoubleSplitComplex(realp: srcReal.baseAddress!,
                                       imagp: srcImag.baseAddress!)
    
    let destination = [DSPDoubleComplex](unsafeUninitializedCapacity: 4) {
        buffer, initializedCount in
        
        vDSP_ztocD(&source, 1,
                   buffer.baseAddress!, 2,
                   4)
        
        initializedCount = 4
    }
    
    // Prints:
    //     "[ 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) ]".
    print(destination)

See Also

Converting split-complex vectors to interleaved-complex vectors

• vDSP_ztoc