function value = wiggle_fp ( x )

%*****************************************************************************80
%
%% wiggle_fp evaluates the derivative of a very oscillatory function.
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    21 September 2019
%
%  Input:
%
%    real x, the argument.
%
%  Output:
%
%    real value, the derivative value.
%
  value = - 100.0 * sin ( 100.0 * x - 700.0 ) ...
    - 240.0 * exp ( - ( 30.0 * x - 31.0 ).^2 ) / sqrt ( pi );

  return
end

