function r8vec_sort_shell_a_test ( )

%*****************************************************************************80
%
%% R8VEC_SORT_SHELL_A_TEST tests R8VEC_SORT_SHELL_A.
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    04 August 2018
%
%  Author:
%
%    John Burkardt
%
  n = 20;

  fprintf ( 1, '\n' );
  fprintf ( 1, 'R8VEC_SORT_SHELL_A_TEST\n' );
  fprintf ( 1, '  R8VEC_SORT_SHELL_A ascending sorts a real vector using Shell''s sort.\n' );
  fprintf ( 1, '\n' );

  seed = 123456789;

  [ a, seed ] = r8vec_uniform_ab ( n, 0.0, 3.0 * n, seed );

  r8vec_print ( n, a, '  Original array:' );

  a = r8vec_sort_shell_a ( n, a );

  r8vec_print ( n, a, '  Ascending sorted array:' );

  return
end
