Re: Adding a new variable to existing netCDF file?

Also ...

 From within NCL create an nc file containing the individual variable.
Then use the netCDF operator 'ncks' to merge the file

    system ("ncks -A new_file.nc orig_file.nc")

the orig_file.nc will have the new variable.

On 9/20/11 11:56 PM, David Brown wrote:
> It can be as simple as:
>
> f = addfile("your_file_name.nc","w") ; open the file for writing -- it really means for modification.
> f->your_new_variable = your_new_variable
>
> The caveat is that if you want to use dimensions that already exist in the file then you need to make sure that "your_variable" has dimension names and sizes that are compatible. If your file is large this operation can be slow, because metadata about the new variable has to be placed at the beginning of the file, and everything following the metadata section must be moved to make room. See the setfileoption procedure under "HeaderReserveSpace" if you are going to be doing this on a regular basis.
> -dave
>
> On Sep 20, 2011, at 11:32 PM, Ashley Berg wrote:
>
>> Is there a way to add a new variable to an already existing netCDF file using NCL? I know how to replace a variable in an existing file, but I'd like to add a new variable onto the end of a netCDF file that already contains about 60 other variables. I couldn't find anything on how to do this, so maybe the only way is to read in and write out all 60 variables plus the new variable to a new netCDF file... but that would be a pain!
>>
>> Thanks.
>> -Ashley
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Received on Wed Sep 21 07:08:54 2011