[ncl-talk] how to get the dimension size in netcdf file

[LeiTing]

Hi, Dennis,
Thanks a lot for your involvement. Yes, as Dave pointed out, both 
getvardims(f)  and  getfiledimsizes(f) work fine. However, I'm seeking a function,
like , getfiledims(f,"Lat") , which will give me the number of the dimension "Lat" in the netcdf file.
This seems not available yet. 
 I hope I make my problem clear enough this time and sorry for any confusions in previous emails.
Best wishes,
Ting

Date: Fri, 24 Apr 2015 15:01:52 -0600
Subject: Re: [ncl-talk] how to get the dimension size in netcdf file
From: shea at ucar.edu
To: leiting2002 at hotmail.com
CC: dbrown at ucar.edu; abrammer at albany.edu; ncl-talk at ucar.edu

Is this what you want?

Remember 'f' (below) has a dual nature ... It is both a variable and a file reference

   f = addfile("...","r")
   
   dNames= getvardims(f)  
   dSizes   = getfiledimsizes(f)  
   print (dNames+"   "+dSizes)


On Fri, Apr 24, 2015 at 2:45 PM, LeiTing <leiting2002 at hotmail.com> wrote:



Dave and Alan, 
My apology for causing that misunderstanding.
Dave, you are right! I missed that function is aksing for a dim size of a variable. 
In my case, those dimensions are only defined however not used for any variables, which are still significant. 
Thanks again.
Best,
Ting

> Date: Fri, 24 Apr 2015 14:25:53 -0600
> Subject: Re: [ncl-talk] how to get the dimension size in netcdf file
> From: dbrown at ucar.edu
> To: abrammer at albany.edu
> CC: leiting2002 at hotmail.com; ncl-talk at ucar.edu
> 
> getfilevardimsizes gets the sizes of the dimensions the apply to a
> specific variable. I thought the question was how to get the size of a
> dimension by name from the file without specifying a particular
> variable.
>  -dave
> 
> 
> On Fri, Apr 24, 2015 at 12:53 PM, Alan Brammer <abrammer at albany.edu> wrote:
> > Isn't that functionality in this function?
> > https://www.ncl.ucar.edu/Document/Functions/Built-in/getfilevardimsizes.shtml
> >
> >
> > Alan.
> >
> > On 24 April 2015 at 14:36, David Brown <dbrown at ucar.edu> wrote:
> >>
> >> Well we would need to create another function to do that. We will
> >> consider it. Thanks for the suggestion.
> >>  -dave
> >>
> >> On Fri, Apr 24, 2015 at 12:32 PM, LeiTing <leiting2002 at hotmail.com> wrote:
> >> > Dave,
> >> > Thank you so much. That is already the solution I need.
> >> > However, can NCL be "smarter" that ,say, I can directly ask for the size
> >> > of
> >> > a named dimension?
> >> > I know I can do it after using the function you pointed out, however,
> >> > I'm
> >> > just wondering if there are some tip that directly do it.
> >> > Thanks a lot.
> >> > Ting
> >> >
> >> >> Date: Fri, 24 Apr 2015 12:01:50 -0600
> >> >> Subject: Re: [ncl-talk] how to get the dimension size in netcdf file
> >> >> From: dbrown at ucar.edu
> >> >> To: leiting2002 at hotmail.com
> >> >> CC: ncl-talk at ucar.edu
> >> >
> >> >>
> >> >> Hi Ting,
> >> >> getfiledimsizes is the function to use.
> >> >> See
> >> >>
> >> >> http://www.ncl.ucar.edu/Document/Functions/Built-in/getfiledimsizes.shtml
> >> >>
> >> >> The example shows how to get the dimensions names along with the sizes.
> >> >> -dave
> >> >>
> >> >>
> >> >> On Fri, Apr 24, 2015 at 10:12 AM, LeiTing <leiting2002 at hotmail.com>
> >> >> wrote:
> >> >> > Dear Ncl folks,
> >> >> > I apologize first if this is a duplicated question though I haven't
> >> >> > found
> >> >> > it.
> >> >> > I have a netcdf file (the "sparse grid" by NSSL), with ncdump output
> >> >> > as
> >> >> > ^^^^^^^^^^^^
> >> >> > dimensions:
> >> >> > Lat = 236 ;
> >> >> > Lon = 355 ;
> >> >> > pixel = 12596 ;
> >> >> > variables:
> >> >> > float RefQC(pixel) ;
> >> >> > ..............................
> >> >> > VV
> >> >> >
> >> >> > I want to get the dimension lat and lon, which can 't be obtained by
> >> >> > ,say,
> >> >> > dimsize (RefQC).
> >> >> > They are also not global attributes.
> >> >> > Hence, I 'm lost on how to access those definitions of "lat" and
> >> >> > "lon"
> >> >> > in
> >> >> > the netcdf file.
> >> >> > Your help is appreciated.
> >> >> > Best wishes,
> >> >> > Ting
> >> >> >
> >> >> >
> >> >> > _______________________________________________
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