public void GetTest()
{
var w0 = Walsh.Get(0);
Assert.That(Enumerable.Range(0, 100).Select(i => w0(i / 100.0)).All(x => x == 1));
var w1 = Walsh.Get(1);
for (int i = 0; i < 100; i++)
{
var x = i / 100.0;
if (x < 0.5)
{
Assert.AreEqual(1.0, w1(x));
}
if (x > 0.5)
{
Assert.AreEqual(-1.0, w1(x));
}
}
var w3 = Walsh.Get(3);
for (int i = 0; i < 100; i++)
{
var x = i / 100.0;
if (x < 0.25)
{
Assert.AreEqual(1.0, w3(x));
}
if (x > 0.75)
{
Assert.AreEqual(1.0, w3(x));
}
if (x > 0.25 && x < 0.75)
{
Assert.AreEqual(-1.0, w3(x));
}
}
}
private double coeffByDef(int n)
{
var w = Walsh.Get(n - 1);
return(Integrals.Trapezoid(x => df(x) * w(x), 0, 1, 10000));
}