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

#*****************************************************************************80
#
## UBVEC_CHECK checks an unsigned binary vector.
#
#  Discussion:
#
#    The only check made is that the entries are all 0 or 1.
#
#    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 UBVEC(N), the vector to be checked.
#
#    Output, integer VALUE, is True if the UBVEC is legal.
#
  value = True

  for i in range ( 0, n ):
    if ( ubvec[i] < 0 or 2 <= ubvec[i] ):
      value = False
      return value

  return value

def ubvec_check_test ( ):

#*****************************************************************************80
#
## UBVEC_CHECK_TEST tests UBVEC_CHECK.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license. 
#
#  Modified:
#
#    22 November 2015
#
#  Author:
#
#    John Burkardt
#
  import numpy as np
  import platform

  n = 5

  print ( '' )
  print ( 'UBVEC_CHECK_TEST' )
  print ( '  Python version: %s' % ( platform.python_version ( ) ) )
  print ( '  UBVEC_CHECK check an unsigned binary vector.' )
  print ( '' )
  print ( '  CHECK?     UBVEC' )
  print ( '' )

  ubvec = np.array ( [ 1, 0, 0, 1, 1 ] )
  check = ubvec_check ( n, ubvec )
  print ( '  %5s:    ' % ( check ), end = '' )
  for j in range ( 0, n ):
    print ( '%d' % (ubvec[j] ), end = '' )
  print ( '' )

  ubvec = np.array ( [ 1, 0, 0, 1, 9 ] )
  check = ubvec_check ( n, ubvec )
  print ( '  %5s:    ' % ( check ), end = '' )
  for j in range ( 0, n ):
    print ( '%d' % (ubvec[j] ), end = '' )
  print ( '' )

  ubvec = np.array ( [ 1, 3, 0, 1, 1 ] )
  check = ubvec_check ( n, ubvec )
  print ( '  %5s:    ' % ( check ), end = '' )
  for j in range ( 0, n ):
    print ( '%d' % (ubvec[j] ), end = '' )
  print ( '' )
#
#  Terminate.
#
  print ( '' )
  print ( 'UBVEC_CHECK_TEST' )
  print ( '  Normal end of execution.' )
  return

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