Re: How to define specific value for BAD?

[Steve Hankin <hankin@xxxxxxxxxxxxx>]

Hi Daniel,

Ferret does not allow you to impose the missing value flag.  The SET
VARIABLE/BAD= qualifier merely allows you to inform Ferret of missing value
flags for a variable to be read from a file.

You can replace all of the missing values in a variable with zeros using the
function
    MISSING(var, 0.0)
however, if the resulting variable is SAVEd to a netCDF file, the
missing_value (and _FillValue) attribute in that file will still be a value
that is inherited from the definition, typically -1.0E+34.

Work-around:

   * Use MISSING(var,0) to define your variable. Write it to a netCDF file.
     Then when you read the data back with Ferret you can use
     SET VARIABLE/BAD=

    - steve

===========================================

Daniel Müller wrote:

> Dear Ferret-Users
>
> I was just wondering how to define a value as bad flag (0 is desired)
> when saving a variable defined by "let my_variable=..." to a NetCDF-File
> using "save/file=test.cdf my_variable".
> Right now when I look at the created file using ncdump i see
> "missing_value = -9.96921e+36f"  and  "missing_value = -9.96921e+36f".
> How to change this to 0 (Zero) within ferret?
> I already tried "set data/bad=0 ..." and "set variable/bad=0
> my_variable" which didn't have the desired effect.
>
> Can anybody give me a hint?
>
> Regards
>
> Daniel

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