public void ToStringTest()
{
// Issue 51:
PolynomialRegression poly = new PolynomialRegression(2);
var x = new double[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
var y = new double[] { 1, 6, 17, 34, 57, 86, 121, 162, 209, 262, 321 };
poly.Regress(x, y);
{
string expected = "y(x) = 3x^2 + 1.99999999999999x^1 + 1.00000000000006x^0";
expected = expected.Replace(".", System.Globalization.CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator);
string actual = poly.ToString();
Assert.AreEqual(expected, actual);
}
{
string expected = "y(x) = 3x^2 + 1.99999999999999x^1 + 1.00000000000006x^0";
string actual = poly.ToString(null, System.Globalization.CultureInfo.GetCultureInfo("en-US"));
Assert.AreEqual(expected, actual);
}
{
string expected = "y(x) = 3.0x^2 + 2.0x^1 + 1.0x^0";
string actual = poly.ToString("N1", System.Globalization.CultureInfo.GetCultureInfo("en-US"));
Assert.AreEqual(expected, actual);
}
{
string expected = "y(x) = 3,00x^2 + 2,00x^1 + 1,00x^0";
string actual = poly.ToString("N2", System.Globalization.CultureInfo.GetCultureInfo("pt-BR"));
Assert.AreEqual(expected, actual);
}
}
public void PolynomialRegressionRegressTest()
{
double[] inputs = { 15.2, 229.7, 3500 };
double[] outputs = { 0.51, 105.66, 1800 };
int degree = 2;
PolynomialRegression target = new PolynomialRegression(degree);
double[] expected = { 8.003175717e-6, 4.882498125e-1, -6.913246203 };
double[] actual;
target.Regress(inputs, outputs);
actual = target.Coefficients;
Assert.AreEqual(expected[0], actual[0], 000.1);
Assert.AreEqual(expected[1], actual[1], 000.1);
Assert.AreEqual(expected[2], actual[2], 000.1);
}
/// <summary>
/// Creates a new polynomial regression directly from data points.
/// </summary>
///
/// <param name="degree">The polynomial degree to use.</param>
/// <param name="x">The input vectors <c>x</c>.</param>
/// <param name="y">The output vectors <c>y</c>.</param>
///
/// <returns>A polynomial regression f(x) that most approximates y.</returns>
///
public static PolynomialRegression FromData(int degree, double[] x, double[] y)
{
PolynomialRegression regression = new PolynomialRegression(degree);
regression.Regress(x, y);
return regression;
}
/// <summary>
/// Creates a new polynomial regression directly from data points.
/// </summary>
///
/// <param name="degree">The polynomial degree to use.</param>
/// <param name="x">The input vectors <c>x</c>.</param>
/// <param name="y">The output vectors <c>y</c>.</param>
///
/// <returns>A polynomial regression f(x) that most approximates y.</returns>
///
public static PolynomialRegression FromData(int degree, double[] x, double[] y)
{
PolynomialRegression regression = new PolynomialRegression(degree);
regression.Regress(x, y);
return(regression);
}