How to calculated the annually mean from monthly data set?

Thu Dec 8 15:11:19 EST 2005

Hi, Guys
    I have a 1000 year-long monthly averaged dataset, which has 12000
data points. I would like to reduce it to annually averaged data. Do
anyone of you know what is best way to do in Grads? Thank you in
advance for your help.

Best,
Ming


Ming Yang
Department of Geological Sciences
University of North Carolina at Chapel Hill
myang at email.unc.edu
919-843-5846