Re: Missing values not recognized

From: Scott Capps <scapps_at_nyahnyahspammersnyahnyah>
Date: Thu, 19 Jul 2007 09:23:57 -0700

Try setting the _FillValue attribute to the variable's missing_value
attribute:

w@_FillValue = -999.
 or
w@_FillValue = w_at_missing_value

Anthony C. Didlake, Jr. wrote:
> Hello,
>
> I'm having a problem with missing values in my NCL script. I'm reading
> in a NetCDF file and grabbing variables with them that have their
> missing value set to -999. However, when I apply NCL functions to
> these variables, it does not recognize the number -999 as missing, but
> rather as a data entry value. For instance, when I use the min
> function, it always returns -999 (even though all the values are not
> missing.) I also used the num and ismissing functions to count the
> number of missing values, and it always returns 0 (even though some
> values are missing.) Below is my script. Are there any reasons that
> this could happen?
>
> Thanks,
> Anthony
>
>
>
> load "/usr/local/ncarg/lib/ncarg/nclex/gsun/gsn_code.ncl"
>
> begin
>
> filename = "200508282031.nc"
> nc_file = addfile(filename,"r")
>
> w = nc_file->WVAR(0,:,:,:)
>
> min_w = min(w)
> x = num(ismissing(w(0,0,:)))
>
> print(min_w)
> print(x)
> print(w_at_missing_value)
>
> end
>
> _______________________________________________
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> ncl-talk_at_ucar.edu
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>
> .
>

-- 
Scott Capps
University of California, Irvine
Department of Earth System Science
Croul Hall
Irvine, CA 92617
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Received on Thu Jul 19 2007 - 10:23:57 MDT

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