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Hi Jianfu, The correct place to post NCO questions is http://sf.net/projects/nco/forums/forum/9830 Please post any followsups there. In answer to your question, you have found a bug which is now fixed. It was caused by NCO using the isnormal() macro to test for strange numbers (like NaNs). Apparently isnormal() treats zero as not normal. I did not realize that. The current NCO snapshot uses isfinite() instead. This fixes the problem you reported. You can download/install the current snapshot or wait for NCO 4.3.9, which will be released real soon now. Thanks for reporting the problem! Charlie -- Charlie Zender, Earth System Sci. & Computer Sci. University of California, Irvine 949-891-2429 )'(
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