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Add a new variable to netCDF file? [message #78073]

Mon, 24 October 2011 16:44

Ashley Berg
Messages: 14
Registered: February 2011

Junior Member

So, I know how to overwrite a variable in a netCDF file, but how do I
add a new one?

I have a netCDF file with about 30 variables and I want to add two new
ones. It would be a pain to have to copy over all 30 vars plus the
new ones into a new file, so is there a way to add variables using the
netCDF operators? I've been experimenting but haven't been able to
find a way to do it (when I try to write a new variable to the file,
it complains that it can't find the variable, which implies it's
looking to overwrite an existing one rather than tack on the new one).

Thanks!

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Re: Add a new variable to netCDF file? [message #78148 is a reply to message #78073]

Tue, 25 October 2011 13:50

Ashley Berg
Messages: 14
Registered: February 2011

Junior Member

On Oct 25, 12:46 pm, "Kenneth P. Bowman" <k-bow...@null.edu> wrote:

> Did you define it first (per Paul's list of steps)?
>
> Ken Bowman

Yes, I followed each one of his steps. If someone has been able to
get it to work, I would appreciate seeing some sample code in case I
made some error... but since I have now successfully used NCL to add
my variables to the file, figuring out how to do it in IDL is not a
priority for me anymore (though others may still be interested).

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Re: Add a new variable to netCDF file? [message #78149 is a reply to message #78073]

Tue, 25 October 2011 11:46

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

In article
<8b005a34-1e1e-4d98-9a61-a16a994fe5dc@j36g2000prh.googlegroups.com>,
Ashley Berg <ashley.berg@gmail.com> wrote:

> Hello all,
>
> Paul's suggestion actually did not work for me (in IDL). The problem
> still seems to be that the variable I want to put into the netCDF file
> doesn't already exist in the file:
>
> % NCDF_VARPUT: Variable "TEST_VAR" not found.
> % NCDF_VARPUT: Variable Inquiry failed, -1 is not a valid variable id.
>
> However, I believe I can use NCL (NCAR Command Language) to add a new
> variable to an existing netCDF file, so I will try that next.

Did you define it first (per Paul's list of steps)?

Ken Bowman

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Re: Add a new variable to netCDF file? [message #78150 is a reply to message #78073]

Tue, 25 October 2011 11:17

Ashley Berg
Messages: 14
Registered: February 2011

Junior Member

Hello all,

Paul's suggestion actually did not work for me (in IDL). The problem
still seems to be that the variable I want to put into the netCDF file
doesn't already exist in the file:

% NCDF_VARPUT: Variable "TEST_VAR" not found.
% NCDF_VARPUT: Variable Inquiry failed, -1 is not a valid variable id.

However, I believe I can use NCL (NCAR Command Language) to add a new
variable to an existing netCDF file, so I will try that next.

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Re: Add a new variable to netCDF file? [message #86933 is a reply to message #78073]

Sun, 15 December 2013 04:49

fereshtehkomijani
Messages: 1
Registered: December 2013

Junior Member

On Tuesday, October 25, 2011 3:14:29 AM UTC+3:30, Ashley Berg wrote:
> So, I know how to overwrite a variable in a netCDF file, but how do I
>
> add a new one?
>
>
>
> I have a netCDF file with about 30 variables and I want to add two new
>
> ones. It would be a pain to have to copy over all 30 vars plus the
>
> new ones into a new file, so is there a way to add variables using the
>
> netCDF operators? I've been experimenting but haven't been able to
>
> find a way to do it (when I try to write a new variable to the file,
>
> it complains that it can't find the variable, which implies it's
>
> looking to overwrite an existing one rather than tack on the new one).
>
>
>
> Thanks!

dear
i am newbie with netcdf files manipulate. my aim is same as Ashley Berg to add 3 variables which all of them are in 3 different netcdf files with fourth netcdf file. all of them have same time step, longitude and latitude. but i cant fine way to do that. is it possible to do that with MATLAB? if it is, would you please tell me how.
cheers
fereshte

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Re: Add a new variable to netCDF file? [message #86934 is a reply to message #86933]

Sun, 15 December 2013 14:37

Andy Sayer
Messages: 127
Registered: February 2009

Senior Member

You might have better luck posting in a Matlab group (this one is for IDL). I don't know how many of us use Matlab (I don't). Good luck!

>
> dear
>
> i am newbie with netcdf files manipulate. my aim is same as Ashley Berg to add 3 variables which all of them are in 3 different netcdf files with fourth netcdf file. all of them have same time step, longitude and latitude. but i cant fine way to do that. is it possible to do that with MATLAB? if it is, would you please tell me how.
>
> cheers
>
> fereshte

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