How to calculate cumulative probability distribution with NCL

Hi, NCL group,
     I'm a little urgent, but does any one know how to use ncl to make
cumulative probability distribution curve? I have an array as XY( nt,
nlat, nlon), and want to make a exceedance probality. I asked the questions
before, but no one answered. Maybe I should use cpdf_bin for doing that (see
webpage in
http://www.ncl.ucar.edu/Document/Functions/Built-in/cdfbin_p.shtml) ,but
still cannot figure out how to match the variables in the function with my
data.

     Thanks for help.

     Yan

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Received on Tue May 11 17:15:19 2010