Multiplies a single-precision complex vector by the conjugate of another single-precision complex vector.


func vDSP_zvcmul(_ __A: UnsafePointer<DSPSplitComplex>, _ __IA: vDSP_Stride, _ __B: UnsafePointer<DSPSplitComplex>, _ __IB: vDSP_Stride, _ __C: UnsafePointer<DSPSplitComplex>, _ __IC: vDSP_Stride, _ __N: vDSP_Length)



Single-precision complex input vector.


Stride for A.


Single-precision complex input vector.


Stride for B.


Single-precision complex output vector.


Stride for C.


The number of elements to process.


This function calculates the products of the first N complex conjugates of A by the corresponding complex elements of B, writing the result to C:

A diagram showing the operation of the vDSP_zvcmul function. There are three rows. The top row represents the first input, vector A. The second row represents the second input, vector B. The bottom row represents the output, vector C. The diagram has connecting lines from the input vectors to the output vector indicating the relationships between the inputs and output.

The operation is:

 for (n = 0; n < N; ++n)
    C[n] = conj(A[n]) * B[n];

The following code shows an example of using vDSP_zvcmul(_:_:_:_:_:_:_:):

let n = vDSP_Length(4)
let stride = vDSP_Stride(1)

var realA: [Float] = [2, 3, 4, 5]
var realB: [Float] = [1, 2, 3, 4]

var imagA: [Float] = [10, 20, 30, 40]
var imagB: [Float] = [4, 3, 2, 1]

var a = [DSPSplitComplex(realp: &realA,
                         imagp: &imagA)]

var b = [DSPSplitComplex(realp: &realB,
                         imagp: &imagB)]

var realC = [Float](repeating: .nan, count: Int(n))
var imagC = [Float](repeating: .nan, count: Int(n))
var c = DSPSplitComplex(realp: &realC,
                        imagp: &imagC)

vDSP_zvcmul(&a, stride,
           &b, stride,
           &c, stride,

print("real", realC) // Prints "real [42.0, 66.0, 72.0, 60.0]"
print("imag", imagC) // Prints "imag [-2.0, -31.0, -82.0, -155.0]"

See Also

Binary Conjugate-Multiply Operations