evaluatePolynomial(usingCoefficients:withVariables:result:)

Declaration

static func evaluatePolynomial<U, V>(usingCoefficients coefficients: [Double], withVariables variables: U, result: inout V) where U : AccelerateBuffer, V : AccelerateMutableBuffer, U.Element == Double, V.Element == Double

Parameters

• coefficients:

  An array that contains the coefficients.

• variables:

  An array that contains the independent variables.

• result:

  An array that receives the result of the calculation.

Discussion

For example, the following code evaluates the polynomial with the coefficients [10.0, 20.0, 30.0] and the variables [7.0, 5.0]:

    let coefficients: [Double] = [10, 20, 30]
    let variables: [Double] = [7, 5]
    
    let result = [Double](
        unsafeUninitializedCapacity: variables.count) {
            buffer, initializedCount in
            
            vDSP.evaluatePolynomial(usingCoefficients: coefficients,
                                    withVariables: variables,
                                    result: &buffer)
            
            initializedCount = 2
        }
    
    // Prints "[660.0, 380.0]".
    //    result[0] = (10 * 7²) + (20 * 7¹) + (30 * 7⁰) = 660
    //    result[1] = (10 * 5²) + (20 * 5¹) + (30 * 5⁰) = 380
    print(result)

See Also

Related Documentation

• vDSP_vpoly

Double-precision polynomial evaluation

• evaluatePolynomial(usingCoefficients:withVariables:)