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

[Pang Jiongming]

Dave,

Thanks a lot. The problem is solved.

Jiongming


On Apr 28, 2018, at 06:34, Dave Allured - NOAA Affiliate <dave.allured at noaa.gov<mailto:dave.allured at noaa.gov>> wrote:

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<mailto: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<mailto: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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