function value = g_06 ( x )

%*****************************************************************************80
%
%% g_06() evaluates - x * sin(10 pi x ) - 1.0;
%
%  Discussion:
%
%    There is a local minimum between 1.80 and 1.90 at about
%    1.850547466.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    19 January 2013
%
%  Author:
%
%    John Burkardt
%
%  Input:
%
%    real X, the point at which F is to be evaluated.
%
%  Output:
%
%    real VALUE, the value of the function at X.
%
  value = - x .* sin ( 10.0 * pi * x ) - 1.0;

  return
end
