missing value issue

Hi,

I have a problem with missing values. I'm comparing model output and
observations (both txt files). Some observations have missing values
(-999.000) and apparently ncl thinks of them as of real values and
calculates bias, RMSE....

I can't figure out how I can do it in ncl for the particular code (!!): to
get it to understand that if the observations have a missing value = -999
to skip this value and go to the next line.

-- 
regards
*******************************************************
*Alexander Semenov*
*
*
PhD Student - Research Assistant
International Arctic Research Center
Department of atmospheric sciences
University of Alaska Fairbanks
930 Koyukuk dr, 408c3
Fairbanks, AK, USA, 99775
work phone +19074742672

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