question: public PolynomialFunction add ( final PolynomialFunction p ) { final int lowLength = FastMath . min ( coefficients . length , p . coefficients . length ) ; final int highLength = FastMath . max ( coefficients . length , p . coefficients . length ) ; double [ ] newCoefficients = new double [ highLength ] ; for ( int i = 0 ; i < lowLength ; ++ i ) { newCoefficients [ i ] = coefficients [ i ] + p . coefficients [ i ] ; } System . arraycopy ( ( coefficients . length < p . coefficients . length ) ? p . coefficients : coefficients , lowLength , newCoefficients , lowLength , highLength - lowLength ) ; return new PolynomialFunction ( newCoefficients ) ; }
target:  Add a polynomial to the instance.