# include <math.h>

/******************************************************************************/

double f10 ( double x )

/******************************************************************************/
/*
  Purpose:

    F10 evaluates the objective function for problem 10.

  Licensing:

    This code is distributed under the GNU LGPL license. 

  Modified:

    03 February 2012

  Author:

    John Burkardt

  Reference:

    Isabel Beichl, Dianne O'Leary, Francis Sullivan,
    Monte Carlo Minimization and Counting: One, Two, Too Many,
    Computing in Science and Engineering,
    Volume 9, Number 1, January/February 2007.

    Dianne O'Leary,
    Scientific Computing with Case Studies,
    SIAM, 2008,
    ISBN13: 978-0-898716-66-5,
    LC: QA401.O44.

  Parameters:

    Input, double X, the argument of the objective function.

    Output, double P10_F, the value of the objective function.
*/
{
  double f;

  f =       cos (       x ) 
    + 5.0 * cos ( 1.6 * x ) 
    - 2.0 * cos ( 2.0 * x ) 
    + 5.0 * cos ( 4.5 * x ) 
    + 7.0 * cos ( 9.0 * x );

  return f;
}