to deal with different time grids

[David Wang <climater@xxxxxxxxx>]

Hello Ferreters,

I have two segments of model data output of the same spatial grids but 
different temporal grids. And I intend to compare (compute the 
difference between) the Eulerian means of the two. But I don't know how 
to deal with the different time grids. I tried to use:
/yes? contour temp2[T=@ave] - temp1[T=@ave,D=1,GT=temp2[D=2]]/
but it gave me a blank plot of "No Valid Data". I also consulted the 
user's guide, but it was fruitless. Any suggestions for a ferret newbie?

Thanks, D.W.

The datasets are:

/yes? show data/full
    currently SET data sets:
   1> ./thetao_O1.001101-001012_eq.nc
name     title                             I         J         K         L
TEMP1    THETAO[J=96:97@AVE]-273.15       1:160     ...       1:27      
1:120
              on grid GFF1 with -1.000000E+34 for missing data
            X=120E:80W  Z=0:317
 time range: 16-JAN-0011 12:00 to 16-DEC-0020 12:00 Calendar:NOLEAP

   2> ./thetao_O1.049101-050012_eq.nc  (default)
name     title                             I         J         K         L
TEMP2    THETAO[J=96:97@AVE]-273.15       1:160     ...       1:27      
1:120
              on grid GCL1 with -1.000000E+34 for missing data
            X=120E:80W  Z=0:317
 time range: 16-JAN-0491 12:00 to 16-DEC-0500 12:00 Calendar:NOLEAP/


--
Daiwei (David) Wang	Graduate Student
Lamont-Doherty Earth Observatory of 
Columbia University
Voice: (845) 365-8694
Email: dwang<AT>ldeo.columbia.edu