Xuexi,
The function that computes the natural log is called "log". Refer to:
http://ngwww.ucar.edu/ngdoc/ng/ref/ncl/functions/log.html
and the page that lists all NCL built-in functions/procedures:
http://ngwww.ucar.edu/ngdoc/ng/ref/ncl/NclFuncsAndProcs.html
Adam
-------------------------------------------------------------
Adam Phillips email: asphilli AT ucar.edu
Climate and Global Dynamics Division tel: (303) 497-1726
National Center for Atmospheric Research fax: (303) 497-1333
P.O. Box 3000
Boulder, CO 80307-3000 http://www.cgd.ucar.edu/~asphilli
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