function f = p38_f ( n, x )

%*****************************************************************************80
%
%% p38_f evaluates the objective function for problem 38.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    11 January 2001
%
%  Author:
%
%    John Burkardt
%
%  Reference:
%
%    Zbigniew Michalewicz,
%    Genetic Algorithms + Data Structures = Evolution Programs,
%    Third Edition,
%    Springer Verlag, 1996,
%    ISBN: 3-540-60676-9,
%    LC: QA76.618.M53.
%
%  Input:
%
%    integer N, the number of variables.
%
%    real X(N), the argument of the objective function.
%
%  Output:
%
%    real F, the value of the objective function.
%
  f =           x(1) * x(1) - 0.3 * cos ( 3.0 * pi * x(1) ) ...
    + 2.0 * x(2) * x(2) - 0.4 * cos ( 4.0 * pi * x(2) ) ...
    + 0.7;

  return
end
