vDSP_vtmergD

Declaration

extern void vDSP_vtmergD(const double *__A, vDSP_Stride __IA, const double *__B, vDSP_Stride __IB, double *__C, vDSP_Stride __IC, vDSP_Length __N);

Parameters

• __A:

  The first input vector.

• __IA:

  The distance between the elements in the first input vector.``

• __B:

  The second input vector.

• __IB:

  The distance between the elements in the second input vector.

• __C:

  The output vector.

• __IC:

  The distance between the elements in the output vector.

• __N:

  The number of complex elements in the output vector.

Discussion

The following code performs a tapered merge between two vectors that represent sine waves at different frequencies:

    let count = 1024
    
    let vectorA: [Double] = (0 ..< count).map {
        return sin(Double($0) * 0.4)
    }
    
    let vectorB: [Double] = (0 ..< count).map {
        return sin(Double($0) * 0.025)
    }
    
    let stride = 1
    let n = vDSP_Length(count)
    
    let tapered = [Double](unsafeUninitializedCapacity: count) {
        buffer, initializedCount in
        
        vDSP_vtmergD(vectorA, stride,
                     vectorB, stride,
                     buffer.baseAddress!, stride,
                     n)
        
        initializedCount = count
    }

The following image shows the result of the tapered merge in tapered.

[Image]

See Also

Vector-to-vector merging functions

• vDSP_vtmerg