// TestLagrange.java

public class TestLagrange
{
  public TestLagrange()
  {
    int n = 9;
    double X[] = {-1.0, -0.7, -0.5, -0.2, -0.0, 0.3, 0.5, 0.8, 1.0};
    double Y[] = {0.0, 0.2, 0.5, 0.7, 1.0, 0.8, 0.5, 0.3, 0.1};
    double L[] = new double[n+1];
    double integral;

    System.out.println("TestLagrange.java running");
    for(int i=0; i<n; i++)
      System.out.println("X["+i+"]="+X[i]+",  Y="+Y[i]);
    Lagrange l1 = new Lagrange(n, X, Y, L);
    for(int i=0; i<n; i++)
      System.out.println("Y["+i+"]="+Y[i]+", fit="+l1.evaluate(n,L,X[i])+
                         ", err="+(Y[i]-l1.evaluate(n,L,X[i])));
    System.out.println(" ");
    integral = l1.integrate(n, L, X[0], X[n-1]);
    System.out.println("integral="+integral);

    System.out.println("end TestLagrange.java");
  }

  public static void main (String[] args)
  {
    new TestLagrange();
  }
}