fatal<east_u> is not a dimension name in variable( u ), could not determine dimension number

Hi,
  when the .ncl script goes onto the line:
  ua = dim_avg_Wrap(u(north_u|:, east_u|:, time|:))
   
  for u :
  nc{'u'} = ncfloat('time', 'z', 'y', 'x'); %% 9788570 elements.
nc{'u'}.long_name = ncchar('x-velocity');
nc{'u'}.units = ncchar('metre/sec');
nc{'u'}.coordinates = ncchar('east_u north_u zz');
   
  error information are as follows:
   
  fatal<east_u> is not a dimension name in variable( u ),could not determine dimension number
   
   
  many thanks for your time and kindness!
   

       
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Received on Mon Apr 28 2008 - 07:45:13 MDT