function value = p26_r8vec ( action, name, dim_num, value )

%*****************************************************************************80
%
%% P26_R8VEC sets or gets R8VEC parameters for problem 26.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    19 March 2007
%
%  Author:
%
%    John Burkardt
%
%  Input:
%
%    string ACTION, the action.
%    'D' sets the  object to a default value.
%    'G' means the current value of the object should be returned.
%    'R' means randomize the object and return it.
%    'S' means the object should be set to VALUE.
%
%    string NAME, the name of the variable.
%
%    integer DIM_NUM, the dimension of the variable.
%
%    real VALUE(DIM_NUM), the value of the variable.
%    if ACTION is 'S', the  VALUE is an input quantity.
%
%  Output:
%
%    real VALUE(DIM_NUM), the value of the variable.
%    if ACTION is 'G' or R, then VALUE is an output quantity.
%
  persistent c
  persistent dim_num_save

  if ( size ( dim_num_save ) == 0 )
    dim_num_save = 0;
  end

  if ( dim_num_save ~= dim_num )
    dim_num_save = 0;
    c = [];
  end

  if ( dim_num_save == 0 )
    dim_num_save = dim_num;
  end

  if ( action == 'D' || action == 'd' )

    if ( name == 'C' || name == 'c' || name == '*' )
      c(1:dim_num) = 1.0 / dim_num;
    end

  elseif ( action == 'G' || action == 'g' )

    if ( name == 'C' || name == 'c' )
      value(1:dim_num) = c(1:dim_num);
    else
      fprintf ( 1, '\n' );
      fprintf ( 1, 'P26_R8VEC - Fatal error!\n' );
      fprintf ( 1, '  Unrecognized name = "%s".\n', name );
      error ( 'P26_R8VEC - Fatal error!' );
    end

  elseif ( action == 'R' || action == 'r' )

    if ( name == 'C' || name == 'c' )
      c = rand ( 1, dim_num );
      value(1:dim_num) = c(1:dim_num);
    else
      fprintf ( 1, '\n' );
      fprintf ( 1, 'P26_R8VEC - Fatal error!\n' );
      fprintf ( 1, '  Unrecognized name = "%s".\n', name );
      error ( 'P26_R8VEC - Fatal error!' );
    end

  elseif ( action == 'S' || action == 's' )

    if ( name == 'C' || name == 'c' )
      c(1:dim_num) = value(1:dim_num);
    else
      fprintf ( 1, '\n' );
      fprintf ( 1, 'P26_R8VEC - Fatal error!\n' );
      fprintf ( 1, '  Unrecognized name = "%s".\n', name );
      error ( 'P26_R8VEC - Fatal error!' );
    end

  else

    fprintf ( 1, '\n' );
    fprintf ( 1, 'P26_R8VEC - Fatal error!\n' );
    fprintf ( 1, '  Unrecognized action = "%s".\n', action );
    error ( 'P26_R8VEC - Fatal error!' );

  end

  return
end
