#! /usr/bin/env python
#
def r8vec_sum ( n, a ):

#*****************************************************************************80
#
## R8VEC_SUM sums the entries of an R8VEC.
#
#  Discussion:
#
#    An R8VEC is a vector of R8's.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    24 January 2015
#
#  Author:
#
#    John Burkardt
#
#  Parameters:
#
#    Input, integer N, the number of entries in the vector.
#
#    Input, real A(N), the vector.
#
#    Output, real VALUE, the sum of the entries.
#
  value = 0.0
  for i in range ( 0, n ):
    value = value + a[i]

  return value

def r8vec_sum_test ( ):

#*****************************************************************************80
#
## R8VEC_SUM_TEST tests R8VEC_SUM.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    24 January 2015
#
#  Author:
#
#    John Burkardt
#
  import platform
  from r8vec_print import r8vec_print
  from r8vec_uniform_ab import r8vec_uniform_ab

  print ( '' )
  print ( 'R8VEC_SUM_TEST' )
  print ( '  Python version: %s' % ( platform.python_version ( ) ) )
  print ( '  R8VEC_SUM sums the entries in an R8VEC.' )

  n = 10
  a_lo = - 10.0
  a_hi = + 10.0
  seed = 123456789

  a, seed = r8vec_uniform_ab ( n, a_lo, a_hi, seed )

  r8vec_print ( n, a, '  Input vector:' )

  value = r8vec_sum ( n, a )

  print ( '' )
  print ( '  Sum of entries = %g' % ( value ) )
#
#  Terminate.
#
  print ( '' )
  print ( 'R8VEC_SUM_TEST:' )
  print ( '  Normal end of execution.' )
  return

if ( __name__ == '__main__' ):
  from timestamp import timestamp
  timestamp ( )
  r8vec_sum_test ( )
  timestamp ( )