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Re: NCDF_ATTPUT _FillValue problem for string arrays? [message #67200 is a reply to message #67134]

Wed, 08 July 2009 12:12

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

Fï¿½LDY Lajos wrote:
>
> On Mon, 6 Jul 2009, Paul van Delst wrote:
>
>> AHA!!!
>>
>> When I change your above test code to use the conventional fill value
>> attribute name as specified in the netCDF Interface Guide,
>> "_FillValue", I get the following:
>>
>> ncid=ncdf_create('test.nc', /clobber)
>> dim32=ncdf_dimdef(ncid, 'dim1', 32)
>> n_absorbers_dimid=ncdf_dimdef(ncid, 'dim2', 9)
>> varid = ncdf_vardef( ncid, 'absorber_units_name',
>> [dim32,n_absorbers_dimid], /char)
>> ncdf_attput, ncid, varid, '_FillValue', ' ' ; <---**** Note the
>> attribute name
>> ncdf_control, ncid, /endef
>> ncdf_close, ncid
>>
>> IDL> .run blah
>> % Compiled module: $MAIN$.
>> % NCDF_CONTROL: Attempt to take the file out of define mode (ENDEF)
>> failed. % (NC_ERROR=-45)
>> % Execution halted at: $MAIN$ 6 scratch/blah.pro
>>
>>
>> So:
>> - if I use "_fillvalue" for the attribute name, the code works fine.
>> - if I use "_FillValue" for the attribute name, the code crashes.
>>
>
> I have found the solution: _FillValue needs to be the same type as the
> variable. ' ' is an IDL string, which is converted to something,
> probably BYTE. So let's add an explicite /CHAR to ncdf_attput:
>
> ncid=ncdf_create('test.nc', /clobber)
> dim32=ncdf_dimdef(ncid, 'dim1', 32)
> n_absorbers_dimid=ncdf_dimdef(ncid, 'dim2', 9)
> varid = ncdf_vardef( ncid, 'absorber_units_name',
> [dim32,n_absorbers_dimid], /char)
> ncdf_attput, ncid, varid, '_FillValue', ' ', /CHAR
> ncdf_control, ncid, /endef
> ncdf_close, ncid
>
> It works now! :-)

Yes, it does for me also.

You, sir, are a star!

Thanks,

paulv

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[Message index]

		Re: NCDF_ATTPUT _FillValue problem for string arrays? By: Foldy Lajos on Tue, 07 July 2009 00:17
		Re: NCDF_ATTPUT _FillValue problem for string arrays? By: Paul Van Delst[1] on Mon, 06 July 2009 14:41
		Re: NCDF_ATTPUT _FillValue problem for string arrays? By: Paul Van Delst[1] on Mon, 06 July 2009 13:41
		Re: NCDF_ATTPUT _FillValue problem for string arrays? By: Foldy Lajos on Mon, 06 July 2009 12:38
		Re: NCDF_ATTPUT _FillValue problem for string arrays? By: R.Bauer on Wed, 08 July 2009 06:55
		Re: NCDF_ATTPUT _FillValue problem for string arrays? By: Paul Van Delst[1] on Wed, 08 July 2009 12:12

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