public void FunctionTest()
{
Laplacian dense = new Laplacian(3.6);
SparseLaplacian target = new SparseLaplacian(3.6);
double[] sx = { 1, -0.555556, 2, +0.250000, 3, -0.864407, 4, -0.916667 };
double[] sy = { 1, -0.666667, 2, -0.166667, 3, -0.864407, 4, -0.916667 };
double[] sz = { 1, -0.944444, 3, -0.898305, 4, -0.916667 };
double[] dx = { -0.555556, +0.250000, -0.864407, -0.916667 };
double[] dy = { -0.666667, -0.166667, -0.864407, -0.916667 };
double[] dz = { -0.944444, +0.000000, -0.898305, -0.916667 };
double expected, actual;
expected = dense.Function(dx, dy);
actual = target.Function(sx, sy);
Assert.AreEqual(expected, actual, 1e-10);
Assert.AreEqual(0.88711080792421337, actual);
Assert.IsFalse(double.IsNaN(actual));
expected = dense.Function(dx, dz);
actual = target.Function(sx, sz);
Assert.AreEqual(expected, actual, 1e-10);
Assert.AreEqual(0.87918038010432886, actual, 1e-10);
Assert.IsFalse(double.IsNaN(actual));
expected = dense.Function(dy, dz);
actual = target.Function(sy, sz);
Assert.AreEqual(expected, actual, 1e-10);
Assert.AreEqual(0.91349716289496652, actual);
Assert.IsFalse(double.IsNaN(actual));
}
public void FunctionTest()
{
double sigma = 2.1;
Laplacian target = new Laplacian(sigma);
double[] x = { 1, 3 };
double[] y = { -1, 2 };
double expected = 0.34479878120059682;
double actual = target.Function(x, y);
Assert.AreEqual(expected, actual);
// For the same input, product should be 1
Assert.AreEqual(1.0, target.Function(x, x));
}