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20051026: Gempak - Please help me to compute average in GDSTAT!!!

The program requires 4 or more grids as the error message states.
At any grid point, if there are fewer than 4 values, the STD calculation
will be set to missing.

If you have only three times, you can use GDDIAG and sum the three grids
and divide.
 GFUNC = quo(sum(s1,sum(s2,s3)),3)

Steve Chiswell
Unidata User Support


>From: "Anh Dao Nguyen" <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200510260945.j9Q9jk3j000288

>Institution: NCHMF
>Package Version: GEMPAK5.7.4
>Operating System: Linux
>Hardware Information: 160GB hardware vollumn
>Inquiry: Hello,
>I am trying on computing the average of grids in three time steps but it seems
>  to be error. I don't know why? When I increase the time steps (5 time steps)
> , it's OK. The error is follow:
>
>GDFILE   Gridfile            BC3Ntd.grd
>GDOUTF   Output grid file    test.grd
>GDATTIM  Grid date/time      all
>GLEVEL   Grid level          500
>GVCORD   Grid vertical coordinate   PRES
>GFUNC    Scalar grid                HGHT
>GRDNAM   Grid parameter name        
>Parameters requested: GDFILE,GDOUTF,GDATTIM,GLEVEL,GVCORD,GFUNC,GRDNAM.
>GEMPAK-GDSTAT>r
>[GDSTAT -6] There are fewr than four grids
>Parameters requested: GDFILE,GDOUTF,GDATTIM,GLEVEL,GVCORD,GFUNC,GRDNAM.
>GEMPAK-GDSTAT>
>
>
>
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