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

[Dennis Shea]

Likely, I am misunderstanding

undef("LeiTing")
function LeiTing(f:file, dimName:string)
local dNames, dSizes, i
begin

   dNames= getvardims(f)
   dSizes   = getfiledimsizes(f)

   i = ind(dNames.eq.dimName)
   if (.not.ismissing(i)) then
       return(dSizes(i))
   else
       print("LeiTing: FATAL: dimName="+dimName+" not present")
       print("dNames+"   "+dSizes)
       exit
   end if

end

The above can be expanded to multiple 'dimNames'

D

On Fri, Apr 24, 2015 at 3:19 PM, David Brown <dbrown at ucar.edu> wrote:

> 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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> >>
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