Re: [netcdfgroup] Question about using nf90_inquire_variable

• To: Jim.Enright@xxxxxxxxxxxxxx
• Subject: Re: [netcdfgroup] Question about using nf90_inquire_variable
• From: Nick Papior <nickpapior@xxxxxxxxx>
• Date: Tue, 14 Jul 2015 17:18:23 +0000

Seems like your code should simply be changed to this, which seems fine,
you need the distinction between UNDEFINED and non-global anyway.

if( varName .eq. 'UNDEFINED' ) then

varid = nf90_global

... nf90_inquire(ncid, nAttributes=numAttr) ...

else

varid = varInfoArray%varInfoArr(idxVar)%varId

call check( nf90_inquire_variable( ncid, varid, nAtts = numAttr )

end if


... (delete first encountered line)


May I also suggest you this project, which eases the mingling of netcdf
creation etc. through a unified API, and all interaction through character
variables.

https://github.com/zerothi/ncdf


Disclaimer, I am the developer and uses it heavily in my development.




2015-07-14 16:13 GMT+00:00 <Jim.Enright@xxxxxxxxxxxxxx>:

> Hi,
>
>
>
> I’m wondering if it is possible to use the nf90_inquire_variable()
> function to find information about global attributes in a similar way to
> nf90_inquire_attribute()?
>
> For example, should it be possible to set varid to be NF90_GLOBAL to find
> the number of global attributes? i.e.:
>
> call check(nf90_inquire_variable(ncid, NF90_GLOBAL, nAtts = numAttr))
>
>
>
> The reason for this query is because we have a code block (snippet shown
> below) which prints some header information by looping over an array of
> variables.
>
> It first calls nf90_inquire_variable to get the number of attributes and
> then uses this to get more details about the attributes by calling
> nf90_inq_attname() and nf90_inquire_attribute().
>
> These latter two functions accept NF90_GLOBAL as “varid” but an error is
> thrown when this is used for varid in nf90_inquire_variable().
>
> Is this the expected behaviour of nf90_inquire_variable? If so, can you
> recommend the best alternative way to get the number of global attributes –
> nf90_inquire() perhaps?
>
>
>
> do idxVar = varBegin, numVars
>
>
>
> varName = varInfoArray%varInfoArr(idxVar)%varName
>
>
>
> if( varName .eq. 'UNDEFINED' ) then
>
> varid = nf90_global
>
> else
>
> varid = varInfoArray%varInfoArr(idxVar)%varId
>
> end if
>
>
>
> call check( nf90_inquire_variable( ncid, varid, nAtts = numAttr )
>
> …
>
> …
>
> do idxAttr = 1, numAttr
>
>
>
> ! Get the names & details of the attributes
>
> call check( nf90_inq_attname( ncid, varid, idxAttr, attrName ))
>
>
>
> call check( nf90_inquire_attribute( ncid, varid, attrName, netCDFType,
> numAttrValues ))
>
> end do
>
> …
>
> end do
>
>
>
> Best regards,
>
> Jim
>
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-- 
Kind regards Nick

• References:
  • [netcdfgroup] Question about using nf90_inquire_variable
    • From: Jim.Enright