public class DifferentialPolynom {

public static double[] diffPoly(double[] coeffs) {
       // one time differentiate
       // y=x^n, y'=n*x^(n-1)
       int n=1 ;
       double[]c=new double[coeffs.length-1] ;

      if (coeffs.length==1) {
          c[1]=0;
          return c ;
      }
               else

       for (int i=1;i<=coeffs.length ;i++)
       {
        c[i-1]=n*coeffs[i] ;
        n=n+1 ;
       }

 return c ;

   }