public void linearDataExtrapolatesLinearValues()
{
double[] data = new double[100];
for (int i = 0; (i < data.Length); i++)
{
data[i] = ((0.25 * i) * -1);
}
var builder = new InterpolatorBuilder();
for (int degree = 1; (degree < 3); degree++)
{
builder.Width = 7;
builder.Degree = degree;
LoessInterpolator loess = builder.interpolate(data);
double y = loess.smoothOnePoint(-100, 0, (data.Length - 1));
Assert.True(y != 0);
Assert.Equal(((0.25 * -100) * -1), y, 5);
y = loess.smoothOnePoint(1000, 0, (data.Length - 1));
Assert.True(y != 0);
Assert.Equal(((0.25 * 1000) * -1), y, 5);
//
}
}
// Utility functions...
private void checkFitToData(double[] data, LoessInterpolator loess, int precision)
{
for (int i = 0; (i < data.Length); i++)
{
Double y = loess.smoothOnePoint(i, 0, (data.Length - 1));
Assert.True(y != 0);
Assert.Equal(data[i], y, precision);
//ssertEquals(String.format("Bad value at %d", i), data[i], y, eps);
}
}