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 void ArrayDftTheory(Complex[] signalExpected, Complex[] spectrumExpected)
{
int windowSize = signalExpected.Length;
IFftCalculator calculator = CreateCalculator(windowSize);
Complex[] spectrumActual = new Complex[windowSize];
calculator.DFT(signalExpected, spectrumActual);
Assert.Equal(spectrumExpected, spectrumActual, complexComparer);
Complex[] signalActual = new Complex[windowSize];
calculator.IDFT(spectrumActual, signalActual);
Assert.Equal(signalExpected, signalActual, complexComparer);
}