@Test
public void testDrop() {

    Polynomial n=Polynomial.valueOf(1,-.2,-.3), d=Polynomial.valueOf(1,-1.8,1);
    RationalFunction fn=new RationalFunction(n, d);
    RationalFunction fn2=fn.drop(10);
    for (int i=0; i<50; ++i){
        assertTrue(Math.abs(fn.get(i+10)-fn2.get(i))<1e-9);
    }
    
}