Интерполяция методом Лангранжа

import java.lang.Math; // headers MUST be above the first class

// one class needs to have a main() method
public class HelloWorld
{
  // arguments are passed using the text field below this editor
  public static void main(String[] args)
  {
     int size = 4;

    double [] x =  { 0.6, 0.65, 0.7, 0.75};
    double [] y = {0.56464, 0.60519, 0.64422,0.68164};
    double xn = 0.64;
    double yn = 0;

    for (int i =0; i<size; ++i)
    {
      double temp = 1;
      for(int j = 0; j < size; ++j )
        if( j!=i) temp*=(xn-x[j])/(x[i]-x[j]);
      yn += temp * y[i];
    }

    System.out.println(yn);
    System.out.println(Math.sin(xn));
  }
}