vDSP_vaam

Declaration

extern void vDSP_vaam(const float *__A, vDSP_Stride __IA, const float *__B, vDSP_Stride __IB, const float *__C, vDSP_Stride __IC, const float *__D, vDSP_Stride __ID, float *__E, vDSP_Stride __IE, vDSP_Length __N);

Parameters

• __A:

  The input vector A in E = (A + B) * (C + D).

• __IA:

  The distance between the elements in the input vector A.

• __B:

  The input vector B in E = (A + B) * (C + D).

• __IB:

  The distance between the elements in the input vector B.

• __C:

  The input vector C in E = (A + B) * (C + D).

• __IC:

  The distance between the elements in the input vector C.

• __D:

  The input vector D in E = (A + B) * (C + D).

• __ID:

  The distance between the elements in the input vector D.

• __E:

  The output vector E in E = (A + B) * (C + D).

• __IE:

  The distance between the elements in the output vector E.

• __N:

  The number of elements that the function processes.

Discussion

This function calculates the products of the first N elements of the addition of vectors A and B and the addition of vectors C and D.

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

[Image]

The following code shows an example of using this function:

    let stride = 1
    let count = 5
    
    let a: [Float] = [ 1,  2,  3,  4,  5]
    let b: [Float] = [10, 20, 30, 40, 50]
    let c: [Float] = [ 5,  4,  3,  2,  1]
    let d: [Float] = [50, 40, 30, 20, 10]
    
    let e = [Float](unsafeUninitializedCapacity: count) {
        buffer, initializedCount in
        
        vDSP_vaam(a, stride,
                   b, stride,
                   c, stride,
                   d, stride,
                   buffer.baseAddress!, stride,
                   vDSP_Length(count))
        
        initializedCount = count
    }
    
    // Prints "[605.0, 968.0, 1089.0, 968.0, 605.0]".
    print(e)

See Also

Quaternary add-add-multiply operations

• vDSP_vaamD