/// <summary>
/// A static transformation method. The length is the nearest power of two that is not greater than the input length.
/// Returns the full result.
/// </summary>
public static IArrayView <double> TransformRaw(IArrayView <double> input, FFTOutputType outputType = FFTOutputType.Power, WindowType windowType = WindowType.Rectangular)
{
int count = input.Count.NearestPowerOfTwo(false);
var fft = new RealFourierTransformation();
double[] window = windowType.Apply(input.Take(count), count).ToArray(), real, imag;
fft.TransformForward(window, out real, out imag);
if (outputType == FFTOutputType.Imaginary)
{
return(imag.AsIArray());
}
if (outputType == FFTOutputType.Power)
{
for (int i = 0; i < real.Length; i++)
{
real[i] = Math.Sqrt(real[i] * real[i] + imag[i] * imag[i]);
}
}
return(real.AsIArray());
}
/// <summary>
/// A static transformation method. The length is the nearest power of two that is not greater than the input length.
/// Returns the full result.
/// </summary>
public static IArrayView<double> TransformRaw(IArrayView<double> input, FFTOutputType outputType = FFTOutputType.Power, WindowType windowType = WindowType.Rectangular)
{
int count = input.Count.NearestPowerOfTwo(false);
var fft = new RealFourierTransformation();
double[] window = windowType.Apply(input.Take(count), count).ToArray(), real, imag;
fft.TransformForward(window, out real, out imag);
if (outputType == FFTOutputType.Imaginary)
return imag.AsIArray();
if (outputType == FFTOutputType.Power)
for (int i = 0; i < real.Length; i++)
real[i] = Math.Sqrt(real[i] * real[i] + imag[i] * imag[i]);
return real.AsIArray();
}
