Ensemble Mean

Hi,

I am trying to do an ensemble mean of 60 members each having 128 x 256
values. Is there any function in NCL that can do ensemble mean or any
sample script?
I am reading the values from ascii file.
I am attaching the script I am trying to use but the Ensemble mean part
of my script is giving me error:

fatal:Assignment type mismatch, right hand side can't be coerced to type
of left hand side
fatal:Execute: Error occurred at or near line 29 in file eke_av.ncl

Thanks,

-- 
*************************************
Soumik Basu
Graduate Student, Research Assistant
International Arctic Research Center
University of Alaska Fairbanks
Fairbanks,Alaska,USA
**************************************
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