Contents

negativeAbsolute(_:result:)

Calculates the negative absolute value of each element in the supplied double-precision vector.

Declaration

static func negativeAbsolute<U, V>(_ vector: U, result: inout V) where U : AccelerateBuffer, V : AccelerateMutableBuffer, U.Element == Double, V.Element == Double

Parameters

  • vector:

    The source vector.

  • result:

    On output, the negative absolute values of the elements in the source vector.

Discussion

For example, the following code calculates the negative absolute values of the elements of an array:

    let values: [Double] = [-1, 2, -3, 4, -5, 6, -7, 8]
    
    let negativeAbsoluteValues = [Double](unsafeUninitializedCapacity: values.count) {
        buffer, initializedCount in
        
        vDSP.negativeAbsolute(values, result: &buffer)
        
        initializedCount = values.count
    }
    
    // Prints "[-1.0, -2.0, -3.0, -4.0, -5.0, -6.0, -7.0, -8.0]".
    print(negativeAbsoluteValues)

See Also

Vector negative absolute functions