/// <summary>
/// Calculates polynomials and derivative. </summary>
/// <param name="n"> the n value </param>
/// <param name="alpha"> the alpha value </param>
/// <param name="beta"> the beta value </param>
/// <returns> the result </returns>
public virtual Pair <DoubleFunction1D, DoubleFunction1D>[] getPolynomialsAndFirstDerivative(int n, double alpha, double beta)
{
ArgChecker.isTrue(n >= 0);
//JAVA TO C# CONVERTER TODO TASK: Most Java annotations will not have direct .NET equivalent attributes:
//ORIGINAL LINE: @SuppressWarnings("unchecked") com.opengamma.strata.collect.tuple.Pair<com.opengamma.strata.math.impl.function.DoubleFunction1D, com.opengamma.strata.math.impl.function.DoubleFunction1D>[] polynomials = new com.opengamma.strata.collect.tuple.Pair[n + 1];
Pair <DoubleFunction1D, DoubleFunction1D>[] polynomials = new Pair[n + 1];
DoubleFunction1D p, dp, p1, p2;
for (int i = 0; i <= n; i++)
{
if (i == 0)
{
polynomials[i] = Pair.of(One, Zero);
}
else if (i == 1)
{
double a1 = (alpha + beta + 2) / 2;
polynomials[i] = Pair.of((DoubleFunction1D) new RealPolynomialFunction1D(new double[] { (alpha - beta) / 2, a1 }), (DoubleFunction1D) new RealPolynomialFunction1D(new double[] { a1 }));
}
else
{
int j = i - 1;
p1 = polynomials[j].First;
p2 = polynomials[j - 1].First;
DoubleFunction1D temp1 = p1.multiply(getB(alpha, beta, j));
DoubleFunction1D temp2 = p1.multiply(X).multiply(getC(alpha, beta, j));
DoubleFunction1D temp3 = p2.multiply(getD(alpha, beta, j));
p = (temp1.add(temp2).add(temp3)).divide(getA(alpha, beta, j));
dp = p.derivative();
polynomials[i] = Pair.of(p, dp);
}
}
return(polynomials);
}
//JAVA TO C# CONVERTER TODO TASK: Most Java annotations will not have direct .NET equivalent attributes:
//ORIGINAL LINE: @Test(expectedExceptions = IllegalArgumentException.class) public void testAddNull()
public virtual void testAddNull()
{
F1.add(null);
}