public void example_2()
{
var left = new VectorD(new[] { 1.0, 3, 4, 9, -13 });
var right = new VectorD(new[] { -2, 5.6, -9, 0.1, 5 });
var expected = 2.017320409990204;
var actual = left.GetAngleBetween(right);
Assert.Equal(expected, actual, 10);
}
public void example_1()
{
var left = new VectorD(5);
left.Set(0, 1);
var right = new VectorD(5);
right.Set(0, 1);
right.Set(2, 1);
var expected = Math.Acos(1.0 / Math.Sqrt(2.0));
var actual = left.GetAngleBetween(right);
Assert.Equal(expected, actual, 10);
}
public void right_angle_is_half_pi()
{
var left = new VectorD(4);
left.Set(0, 1);
left.Set(2, 1);
var right = new VectorD(4);
right.Set(1, 1);
right.Set(3, 1);
var expected = Math.PI / 2.0;
var actual = left.GetAngleBetween(right);
Assert.Equal(expected, actual, 10);
}