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Re: MISSING function
Hi Yogesh,
To change or set the missing-value flag of a variable in a netCDF file,
use the command SET VAR/BAD=
SET VAR/BAD=-9999 co2
If there was already a missing_value or _FillValue attribute for co2 in
the netCDF file, then previously missing data is still missing, and the
flag for all missing values is now -9999.
The MISSING function does not set the missing-value flag. It replaces
the missing values in a variable with the given value. So, if you have
a variable B with values already marked as missing, and you wanted to
fill in the missing values with, say, zero, you could do
LET a = MISSING(b, 0)
And the variable A would have all the valid values of B, and where B was
invalid, it would contain the value 0.
Ansley
Yogesh K. Tiwari wrote:
Hello Ferret Users,
I have netcdf file and after doing ncdump of a variable co2, some of
the values are -9999.
I want to treat this value as missing value.
I tried to teach ferret this missing value by using the MISSING
function like :-
let a = -9999
let missing_default = `a, RETURN=bad`
let co2_default = MISSING(co2, missing_default)
But the result still includs the missing value -9999 in the shade plot
and the CO2 values are -200,-300 like that whereas my data is ok and
have no negative co2 value.
Whether I did correctly ?? then why result dosen't chang with or
without missing function.
Whether ferret like -9999 as missing value ?
Many thanks in advance for your help.
Regards,
Yogesh
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