#! /usr/bin/env python
#
def ubvec_reverse ( n, ubvec1 ):

#*****************************************************************************80
#
## UBVEC_REVERSE reverses a UBVEC.
#
#  Discussion:
#
#    A UBVEC is a vector of N binary digits.
#
#    A UBVEC can be interpreted as a binary representation of an
#    unsigned integer, with the first entry being the coefficient of
#    2^(N-1) and the last entry the coefficient of 1.
#
#    UBVEC   #
#    -----  --
#    00000   0
#    00001   1
#    00010   2
#    10000  16
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    22 November 2015
#
#  Author:
#
#    John Burkardt
#
#  Parameters:
#
#    Input, integer N, the length of the vectors.
#
#    Input, integer UBVEC1(N), the vector to be reversed.
#
#    Output, integer UBVEC2(N), the reversed vector.
#
  import numpy as np

  ubvec2 = np.zeros ( n )

  for i in range ( 0, n ):
    ubvec2[i] = ubvec1[n-1-i]

  return ubvec2

def ubvec_reverse_test ( ):

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

  n = 5

  print ( '' )
  print ( 'UBVEC_REVERSE_TEST' )
  print ( '  Python version: %s' % ( platform.python_version ( ) ) )
  print ( '  UBVEC_REVERSE reverses an unsigned binary vector.' )
  print ( '' )
  print ( '  UBVEC  Reversed' )
  print ( '' )

  seed = 123456789

  for i in range ( 0, 5 ):
    ubvec1, seed = ubvec_random ( n, seed )
    ubvec2 = ubvec_reverse ( n, ubvec1 )
    print ( '  ', end = '' )
    for j in range ( 0, n ):
      print ( '%d' % ( ubvec1[j] ), end = '' )
    print ( '  ', end = '' )
    for j in range ( 0, n ):
      print ( '%d' % ( ubvec2[j] ), end = '' )
    print ( '' )
#
#  Terminate.
#
  print ( '' )
  print ( 'UBVEC_REVERSE_TEST' )
  print ( '  Normal end of execution.' )
  return

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