Vector Command with Defined Variables

[Frank and Michele Schenk <fmschenk@xxxxxxxxx>]

Hi all,

Another problem, hopefully with an easy solution.

I am running ferret 4.91 on SGI Irix.

I have a cdf file as follows:

    currently SET data sets:
    1> ./winds.cdf  (default)
 name     title   I         J       K         L
 UCOM     UCOM  1:129     1:129     1:1     1:365
 VCOM     VCOM  1:129     1:129     1:1     1:365

These are daily values of the u and v components of
the wind.  I want to compute the jan avg by averaging
the first 30 days, feb avg using the secong 30 days,
and so on.  

I am trying the following:

let u_jan = ucom[l=1:30@ave]
let v_jan = vcom[l=1:30@ave]
... and so on down to u_dec and v_dec.
I have listed the data and everything looks fine.  The
averaging seems to have worked properly.

Then I try to use the vector command like:

vector/nolabels/length=5/xskip=7/yskip=7 u_jan, v_jan
vector/nolabels/length=5/xskip=7/yskip=7 u_feb, v_feb

I get plots, however the plots are identical, but the
listed data have different values.

stat u_jan
 
             UCOM[L=1:30@AVE]
             LONGITUDE: 132.5W(227.5) to 120W(240)
             LATITUDE: 35N to 47.5N
             Z:  N/A
             T (DAY): 0.5 to 30.5
             DATA SET: ./winds.cdf
 
 Total # of data points: 16641 (129*129*1*1)
 # flagged as bad  data: 0
 Minimum value: -1.052
 Maximum value: 4.3403
 Mean    value: 1.8451       (unweighted average)
 Standard deviation: 1.3545

stat u_feb
 
             UCOM[L=31:60@AVE]
             LONGITUDE: 132.5W(227.5) to 120W(240)
             LATITUDE: 35N to 47.5N
             Z:  N/A
             T (DAY): 30.5 to 60.5
             DATA SET: ./winds.cdf
 
 Total # of data points: 16641 (129*129*1*1)
 # flagged as bad  data: 0
 Minimum value: -0.90154
 Maximum value: 4.2079
 Mean    value: 1.9157       (unweighted average)
 Standard deviation: 1.3254

Do I need to re-grid u_jan and v_jan, ... variables
again?  I read something about vector only being
applicable to 2-D variables.

Any assistance is appreciated.

Thanks,

Frank Schenk
Naval Postgraduate School

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