/// <summary>
/// Inverse discrete Fourier transform. Input array of arbitrary size.
/// </summary>
/// <param name="input">Input array to be transformed.</param>
/// <returns>Output Fourier transformed array.</returns>
public static Double[] InverseDiscreteTransform(Double[] input)
{
return input.Length > 0 ? Double.DiscreteTransform(input.Map(c => c.Conjugate)).Map(c => c.Conjugate / (double)input.Length) : new Double[0];
}