#! /usr/bin/env python
#
def ubvec_rank_gray ( n, ubvec ):

#*****************************************************************************80
#
## UBVEC_RANK_GRAY ranks a UBVEC according to the Gray ordering.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    22 November 2015
#
#  Author:
#
#    John Burkardt
#
#  Parameters:
#
#    Input, integer N, the number of components of the vector.
#
#    Input, integer UBVEC(N), the vector to be printed.
#
#    Output, integer RANK, the rank of the BVEC.
#
  from ubvec_to_ui4 import ubvec_to_ui4
  from ui4_rank_gray import ui4_rank_gray

  ui4 = ubvec_to_ui4 ( n, ubvec )
  rank = ui4_rank_gray ( ui4 )

  return rank

def ubvec_rank_gray_test ( ):

#*****************************************************************************80
#
## UBVEC_RANK_GRAY_TEST tests UBVEC_RANK_GRAY.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license. 
#
#  Modified:
#
#    22 November 2015
#
#  Author:
#
#    John Burkardt
#
  import platform
  from ui4_to_ubvec import ui4_to_ubvec

  n = 5

  print ( '' )
  print ( 'UBVEC_RANK_GRAY_TEST' )
  print ( '  Python version: %s' % ( platform.python_version ( ) ) )
  print ( '  UBVEC_RANK_GRAY ranks a UBVEC in the Gray ordering.' )
  print ( '' )
  print ( '  UBVEC   Rank' )
  print ( '' )
 
  for ui4 in range ( 0, 32 ):
    ubvec = ui4_to_ubvec ( ui4, n )
    rank = ubvec_rank_gray ( n, ubvec )
    print ( '  ', end = '' )
    for j in range ( 0, n ):
      print ( '%2d' % ( ubvec[j] ), end = '' )
    print ( '  %2d' % ( rank ) )
#
#  Terminate.
#
  print ( '' )
  print ( 'UBVEC_RANK_GRAY_TEST' )
  print ( '  Normal end of execution.' )
  return

if ( __name__ == '__main__' ):
  from timestamp import timestamp
  timestamp ( )
  ubvec_rank_gray_test ( )
  timestamp ( )