public void Gradient()
{
var f = new PolynomialFunction <double>();
var grad = f.Gradient(new Vector <double>(new[] { 2d }),
new Vector <double>(new[] { 3d })).ToArray();
Assert.Single(grad);
Assert.True(1e-14 > Math.Abs(1 - grad[0]));
grad = f.Gradient(new Vector <double>(new[] { 2d, 1d }),
new Vector <double>(new[] { 2d })).ToArray();
Assert.True(grad.Length == 2);
Assert.True(1e-14 > Math.Abs(2 - grad[0]));
Assert.True(1e-14 > Math.Abs(1 - grad[1]));
grad = f.Gradient(new Vector <double>(new[] { 2d, 3d, 1d }),
new Vector <double>(new[] { 2d })).ToArray();
Assert.True(grad.Length == 3);
Assert.True(1e-14 > Math.Abs(4 - grad[0]));
Assert.True(1e-14 > Math.Abs(2 - grad[1]));
Assert.True(1e-14 > Math.Abs(1 - grad[2]));
}
public void Value()
{
var f = new PolynomialFunction <double>();
Assert.True(1e-14 > Math.Abs(2 - f.Value(new Vector <double>(new[] { 2d }),
new Vector <double>(new[] { 2d }))));
Assert.True(1e-14 > Math.Abs(3 - f.Value(new Vector <double>(new[] { 3d }),
new Vector <double>(new[] { 2d }))));
Assert.True(1e-14 > Math.Abs(7 - f.Value(new Vector <double>(new[] { 3d, 1d }),
new Vector <double>(new[] { 2d }))));
Assert.True(1e-14 > Math.Abs(34 - f.Value(new Vector <double>(new[] { 3d, 2d, 1d }),
new Vector <double>(new[] { 3d }))));
}