[ncl-talk] Adding a new variable to an existing netcdf4 file

[Dave Allured - NOAA Affiliate]

Jiongming,

Sorry, I missed something in your first message.  For the following method
to work, do not use filevarattdef from the NCL website example.  Just write
each NC_CHAR attribute directly using the single command below.

--Dave


On Fri, Apr 27, 2018 at 1:48 PM, Dave Allured - NOAA Affiliate <
dave.allured at noaa.gov> wrote:

> Jiongming,
>
> I think you want to write an attribute as type NC_CHAR, to a netcdf4
> file.  Is that right?  If so, then use this kind of type conversion in NCL:
>
>     f->var at attrib = tochar ("any string")
>
> Please note that any_string must be scalar (single string, not array) for
> this method, because of a netcdf format constraint.  That is the most
> common need.  There are more complicated methods for arrays of strings.
>
> --Dave
>
>
> On Fri, Apr 27, 2018 at 5:07 AM, Pang Jiongming <pang.j.m at hotmail.com>
> wrote:
>
>> Hi there,
>>
>> I’m a NCL user, and being facing with a problem when I use NCL to add a
>> new variable with attributes to an existing netcdf4 file.
>>
>> My wrfoutput from WRF/Chem is netcdf4 format. I need to add a new
>> variable with attributes. By following the example in NCL website,
>> functions addfile, filevardef, and filevarattdef were used. After that,
>> there is a tag ’string’  before all attributes which contains characters of
>> the new variable. I search online, it shows that it is NC_STRING, not
>> NC_CHAR. Could you help me to solve it? Thank you very much.
>>
>> Best regards,
>> Jiongming
>
>
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