vDSP_ctozD

Declaration

extern void vDSP_ctozD(const DSPDoubleComplex *__C, vDSP_Stride __IC, const DSPDoubleSplitComplex *__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 DSPDoubleComplex structures to a DSPDoubleSplitComplex structure:

    let source: [DSPDoubleComplex] = [
        DSPDoubleComplex(real: 1.0, imag: 10.0),
        DSPDoubleComplex(real: 2.0, imag: 20.0),
        DSPDoubleComplex(real: 3.0, imag: 30.0),
        DSPDoubleComplex(real: 4.0, imag: 40.0),
    ]
    
    let destReal = UnsafeMutableBufferPointer<Double>.allocate(capacity: 4)
    let destImag = UnsafeMutableBufferPointer<Double>.allocate(capacity: 4)
    
    var destination = DSPDoubleSplitComplex(realp: destReal.baseAddress!,
                                            imagp: destImag.baseAddress!)
    
    vDSP_ctozD(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]".

See Also

Converting interleaved-complex vectors to split-complex vectors

• vDSP_ctoz