Contents

multiply(addition:addition:)

Returns the single-precision element-wise product of the sums of two pairs of vectors.

Declaration

static func multiply<S, T, U>(addition additionAB: (a: S, b: T), addition additionCD: (c: U, d: U)) -> [Float] where S : AccelerateBuffer, T : AccelerateBuffer, U : AccelerateBuffer, S.Element == Float, T.Element == Float, U.Element == Float

Parameters

  • additionAB:

    A tuple that contains the vectors A and B in E = (A + B) * (C + D).

  • additionCD:

    A tuple that contains the vectors C and D in E = (A + B) * (C + D).

Mentioned in

Return Value

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

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 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 = vDSP.multiply(addition: (a, b),
                          addition: (c, d))
    
    // Prints "[605.0, 968.0, 1089.0, 968.0, 605.0]".
    print(e)

See Also

Multiplication