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Re: NCDF_ATTPUT _FillValue problem for string arrays? [message #67134]

Tue, 07 July 2009 00:17

Foldy Lajos
Messages: 268
Registered: October 2001

Senior Member

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! :-)

regards,
lajos

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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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