Re: [ferret_users] NaN handled?

[Ansley Manke <ansley.b.manke@xxxxxxxx>]

Hi Ryo,
Please look up "NaN, in netCDF files" in the Ferret Users Guide Index, http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/index-1/index

Here is the information:

If there are values of NaN in the file, then NaN must be listed as either the "missing_value" OR "_FillValue" attribute and then NaN is the missing value. Or, the user may specify SET VARIABLE/BAD=NAN (case insensitive) to designate the Fortran value NaN (not a number) as the bad value flag for a given variable in a netCDF dataset.

Ansley

Ryo Furue wrote:

Hi Ferret users,

I'm wondering how NaNs in a netCDF file are handled.
In the Ferret mailing list archive, I found a comment
that NaNs in a netCDF file are OK.  But, I get the attached
plot from

  yes? list/k=1 gvel_x_0

  [ . . . The field contains only "nan" and "0.0000" . . . ]

  yes? fill/k=1/lev=(-10,10,1) gvel_x_0

I expected NaN is treated as a missing_value.
(The variable gvel_x_0 doesn't have a missing_value or
_FillValue attribute, by the way.)

The Ferret I use is

        FERRET v6.2
        Linux(g77) 2.4.21-32 - 05/19/09
         7-Aug-09 16:20

Regards,
Ryo
  

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