public void Transform1DArguments()
{
Assert.Throws <ArgumentNullException>(() => FastFourierTransformF.Transform1D(null, true));
Assert.Throws <ArgumentNullException>(() => FastFourierTransformF.Transform1D(null, 2, true));
Assert.Throws <ArgumentException>(() => FastFourierTransformF.Transform1D(new Vector2F[0], true));
Assert.Throws <ArgumentException>(() => FastFourierTransformF.Transform1D(new Vector2F[13], true));
FastFourierTransformF.Transform1D(new Vector2F[1], true);
// This is ok.
FastFourierTransformF.Transform1D(new Vector2F[2], true);
FastFourierTransformF.Transform1D(new Vector2F[16], false);
}
public void Transform1DComparedWithDft()
{
// Transform forward and inverse and compare with initial values.
var random = new Random(1234567);
var s = new Vector2F[16];
var t = new Vector2F[16];
for (int i = 0; i < s.Length; i++)
{
s[i] = random.NextVector2F(-10, 10);
t[i] = s[i];
}
FastFourierTransformF.DFT(s, true);
FastFourierTransformF.Transform1D(t, true);
for (int i = 0; i < s.Length; i++)
{
Assert.IsTrue(Vector2F.AreNumericallyEqual(s[i], t[i]));
}
}
public void Transform1DAs2DRow()
{
// Result of 2D with one row/column must be the same as 1D.
var fft = new FastFourierTransformF(16);
var random = new Random(1234567);
var s1D = new Vector2F[8];
var s2D = new Vector2F[1, 8];
for (int i = 0; i < s1D.Length; i++)
{
s1D[i] = random.NextVector2F(-10, 10);
s2D[0, i] = s1D[i];
}
FastFourierTransformF.Transform1D(s1D, true);
fft.Transform2D(s2D, true);
for (int i = 0; i < s1D.Length; i++)
{
Assert.AreEqual(s1D[i], s2D[0, i]);
}
}