f(x) = exp ( c * product ( x(1:m) ) );
        </li>
        <li>
          f(x) = product ( c(1:m) * exp ( - c(1:m) * x(1:m) ) );
        </li>
        <li>
          f(x) = cos ( 2 * pi * r + sum ( c(1:m) * x(1:m) ) ), <br>
          Genz "Oscillatory";
        </li>
        <li>
          f(x) = 1 / product ( c(1:m)^2 + (x(1:m) - x0(1:m))^2),<br>
          Genz "Product Peak";
        </li>
        <li>
          f(x) = 1 / ( 1 + sum ( c(1:m) * x(1:m) ) )^(m+r),<br>
          Genz "Corner Peak";
        