public void SpanDftTheory(Complex[] signalExpected, Complex[] spectrumExpected)
{
int windowSize = signalExpected.Length;
IFftCalculator calculator = CreateCalculator(windowSize);
Span <double> signalExpectedReal = stackalloc double[windowSize];
Span <double> signalExpectedImaginary = stackalloc double[windowSize];
ComplexSpan signalExpectedSpan = new ComplexSpan(signalExpectedReal, signalExpectedImaginary);
signalExpected.CopyTo(signalExpectedSpan);
Span <double> spectrumExpectedReal = stackalloc double[windowSize];
Span <double> spectrumExpectedImaginary = stackalloc double[windowSize];
ComplexSpan spectrumExpectedSpan = new ComplexSpan(spectrumExpectedReal, spectrumExpectedImaginary);
spectrumExpected.CopyTo(spectrumExpectedSpan);
Span <double> signalActualReal = stackalloc double[windowSize];
Span <double> signalActualImaginary = stackalloc double[windowSize];
ComplexSpan signalActualSpan = new ComplexSpan(signalActualReal, signalActualImaginary);
Span <double> spectrumActualReal = stackalloc double[windowSize];
Span <double> spectrumActualImaginary = stackalloc double[windowSize];
ComplexSpan spectrumActualSpan = new ComplexSpan(spectrumActualReal, spectrumActualImaginary);
calculator.DFT(signalExpectedSpan, spectrumActualSpan);
Assert.Equal(spectrumExpected, spectrumActualSpan.ToArray(), complexComparer);
calculator.IDFT(spectrumActualSpan, signalActualSpan);
Assert.Equal(signalExpected, signalActualSpan.ToArray(), complexComparer);
}
public static void CopyTo(this ComplexSpan span, Complex[] array)
{
Span<double> realSpan = span.Real;
Span<double> imaginarySpan = span.Imaginary;
for (int i = 0; i < realSpan.Length; i++)
{
array[i] = new Complex(realSpan[i], imaginarySpan[i]);
}
}
public static void CopyTo(this Complex[] array, ComplexSpan span)
{
Span<double> realSpan = span.Real;
Span<double> imaginarySpan = span.Imaginary;
for (int i = 0; i < realSpan.Length; i++)
{
realSpan[i] = array[i].Real;
imaginarySpan[i] = array[i].Imaginary;
}
}
public static Complex[] ToArray(this ComplexSpan span)
{
Complex[] array = new Complex[span.Real.Length];
span.CopyTo(array);
return array;
}
