[Fwd: @ave function]

[Muyin Wang <muyin@xxxxxxxxxxxxx>]

Ops, I forgot to include the results from ferret. Here is the complete message
again. 


Hello,
 I am processing the NCEP reanalysis data, and something strange happened to me
when I tried to plot the vertical cross sections along a point. Below you will
see that I am trying to compute monthly means for the month of April. If I
specify the particular point of Y, the @ave function works find,
however, when if I tried to list several points at the same time, the values I
got are not corrected.
 For example, at y=72.5N, the average of t1 should be 3.976, but at the bottom
of the list it became -13.32! What can be wrong here?

 I am processing multi year data together, can this be a problem?
 Thanks.
Muyin

yes? list t1[l=91:120@ave]
             AIR[D=air.1990.nc]  - AIR[D=air.day.ltm.nc] -273.15
             LONGITUDE: 157.5W
             LATITUDE: 72.5N
             HEIGHT (millibar): 925
             TIME: 31-MAR-1990 12:00 to 30-APR-1990 12:00 (averaged)
          3.976
yes? show region 85N   / 71: -17.62
default region:
        X=156.8W
        Y=71.3N
        Z=925
        T/L is unspecified
yes? list/y=40:85 t1[l=91:120@ave]
             AIR[D=air.1990.nc]  - AIR[D=air.day.ltm.nc] -273.15
             HEIGHT (millibar): 925
             TIME: 31-MAR-1990 12:00 to 30-APR-1990 12:00 (averaged)
              157.5W
               82
 82.5N / 70: -17.23
 80N   / 69: -16.36
 77.5N / 68: -14.69
 75N   / 67: -13.33
 72.5N / 66: -13.32
 70N   / 65: -13.86
 67.5N / 64: -13.46
 65N   / 63: -11.94
 62.5N / 62: -10.38
 60N   / 61:  -9.53
 57.5N / 60:  -9.24
 55N   / 59:  -9.27
 52.5N / 58:  -9.68
 50N   / 57: -10.50
 47.5N / 56: -11.38
 45N   / 55: -11.86
 42.5N / 54: -11.69
 40N   / 53: -10.92