#ifndef USERSET_FILE
#define USERSET_FILE
#include <cmath>
/**
 * User function: f(@p x,@p y)
 * @param[in] x		x-coordinate of discretization point
 * @param[in] y		y-coordinate of discretization point
 * @return  value for right hand side f(@p x,@p y)
 */
double FunctF(double const x, double const y);

/**
 * User function: u(@p x,@p y)
 * @param[in] x		x-coordinate of discretization point
 * @param[in] y		y-coordinate of discretization point
 * @return  value for solution vector u(@p x,@p y)
 */
double FunctU(double const x, double const y);


/**
 * User function: f(@p x,@p y) = @f$ x^2 \sin(2.5\pi y)@f$.
 * @param[in] x		x-coordinate of discretization point
 * @param[in] y		y-coordinate of discretization point
 * @return  value f(@p x,@p y)
 */
inline
double fNice(double const x, double const y)
{
    //return x * x * std::sin(2.5 * M_PI * y);               // solution u
    return std::sin(M_PI*2.5*y)*(M_PI*M_PI*2.5*2.5*x*x - 2); // -Laplacian(u)
}

/**
 * User function: f(@p x,@p y) = 0$.
 * @param[in] x		x-coordinate of discretization point
 * @param[in] y		y-coordinate of discretization point
 * @return  value 0
 */
inline
double f_zero(double const x, double const y)
//double f_zero(double const  /*x*/, double const /*y*/)
{
    return 0.0 + 0.0*(x+y);
}

#endif