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

[David Brown]

Hi Dennis,
That was my original suggestion -- at least indirectly -- since that
is what the example in getfiledimsizes does.

My understanding is that Ting would like a function something like
getdimsize(f, dimname). Or more likely a plural version that would
work with an array of dimnames.
 -dave


On Fri, Apr 24, 2015 at 3:01 PM, Dennis Shea <shea at ucar.edu> wrote:
> 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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>>
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