# nco script by Feng He, 4/19/04, ncdtrnd
# this script calculates the mean of a data set and then detrends it by subtracting that mean.
# here is the demo of this command:
# say you want to calculate the anomaly of skt in ncep data skt.mon.ltm.nc
# and you want to generate the skta.mon.ltm.nc that stores the anomaly you
# calculate:

# DEMO CAMMAND:
# ncdtrnd skt skt.mon.ltm.nc skta.mon.ltm.nc
# Good Luck!!
                                                                              
                                                                             

ncwa -O  -a time -v $1 $2 foo.nc
ncrename -O -v $1,avg foo.nc
ncks -A -v avg  foo.nc  $2
ncap -O -s "dev=$1-avg" $2 $2
ncks -O -v dev $2 $3
rm foo.nc