vDSP_vsbsmD

Declaration

extern void vDSP_vsbsmD(const double *__A, vDSP_Stride __IA, const double *__B, vDSP_Stride __IB, const double *__C, double *__D, vDSP_Stride __ID, vDSP_Length __N);

Parameters

• __A:

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

• __IA:

  The distance between the elements in the input vector A.

• __B:

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

• __IB:

  The distance between the elements in the input vector B.

• __C:

  The input scalar value C in D = (A - B) * C.

• __D:

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

• __ID:

  The distance between the elements in the output vector D.

• __N:

  The number of elements that the function processes.

Discussion

This function calculates the element-wise difference of vectors A and B, multiplies the difference by scalar value C, and writes the result to vector D.

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

[Image]

The following code shows an example of using this function:

    let stride = 1
    let count = 5
    
    let a: [Double] = [ 1,  2,  3,  4,  5]
    let b: [Double] = [10, 20, 30, 40, 50]
    let c: Double = 5
    
    let d = [Double](unsafeUninitializedCapacity: count) {
        buffer, initializedCount in
        
        vDSP_vsbsmD(a, stride,
                    b, stride,
                    [c],
                    buffer.baseAddress!, stride,
                    vDSP_Length(count))
        
        initializedCount = count
    }
    
    // Prints "[-45.0, -90.0, -135.0, -180.0, -225.0]".
    print(d)

See Also

Vector-vector-scalar subtract-multiply operations

• vDSP_vsbsm