[ncl-talk] _FillValue directly from a file variable

Tue Sep 11 08:06:13 MDT 2018

The type of  the _FillValue attribute should be the same as the variable
eith which it is associated.

*???*

*typeVarGrib = getfilevartypes( f, varGrib )*

*if ( isfilevaratt( f, varGrib, "_FillValue" ) ) then        fill =
f->$varGrib$@_FillValueelse        fill = default_fillvalue( typeVarGrib
)   ; <=====end if*

*http://www.ncl.ucar.edu/Document/Functions/Built-in/default_fillvalue.shtml*
<http://www.ncl.ucar.edu/Document/Functions/Built-in/default_fillvalue.shtml>

On Tue, Sep 11, 2018 at 6:28 AM, Mateus da Silva Teixeira <
mateusstex at gmail.com> wrote:

> Thank you Dennis and Toni for support.
>
> I had forgotten I could use "attValue = f->*$*varname*$**@**$*attname*$*",
> directly, without load variable previously.
>
> So, with this tip, I write:
>
> *typeVarGrib = getfilevartypes( f, varGrib )*
>
>
>
>
>
> *if ( isfilevaratt( f, varGrib, "_FillValue" ) ) then        fill =
> f->$varGrib$@_FillValueelse        fill = default_fillvalue( typeof(
> typeVarGrib ) )end if*
>
> It works ok if *_FillValue* exist, but if it doesn't, I can't pass the
> type of grib file variable obtained with *getfilevartypes*, even using $
> with *typeVarGrib* variable.
>
> Is there a way to pass the content of *typeVarGrib* to *typeof* function?
>
> Thanks,
>
> Mateus
>
>
>
>
>
> Em seg, 10 de set de 2018 às 20:03, Dennis Shea <shea at ucar.edu> escreveu:
>
>> Maybe, the following is what you want?
>>
>> *load* "./getvaratt_value"   ; attached
>>
>> ;---- TEST ----
>>   f = addfile("FOO.nc", "r")
>>
>>   fill = *getfilevaratt_value*(f, "phooey", "_FillValue")
>>   print(fill)
>>
>>   g = addfile("FOO.grb", "r")
>>   FILL = *getfilevaratt_value*(g, "PHOOEY, "_FillValue")
>>   print(FILL)
>>
>> ====================
>> You don't 'need' a function but I'd suggest it for error checking and, in
>> some sense, clarity.
>>
>> You could do it directly .... IF the variable and IF the attribute exist
>>
>> attValue = f->*$*varname*$**@**$*attname*$*
>>
>>
>> On Mon, Sep 10, 2018 at 3:08 PM, Toni Klemm <toni-klemm at tamu.edu> wrote:
>>
>>> Hm, I’m not familiar with GRIB files. But generally, don’t you *have* to
>>> load the content from all files if you want to aggregate content from
>>> multiple files into one? Or are the files too large to load them all at
>>> once?
>>>
>>> Toni
>>>
>>>
>>>
>>> *Toni Klemm, Ph.D.*Postdoctoral Research Associate
>>> Department of Ecosystem Science and Management
>>> College of Agriculture and Life Sciences
>>> Texas A&M University, College Station, TX
>>> Contributor to the Early Career Climate Forum <http://www.eccforum.org>
>>> www.toni-klemm.de | @toniklemm <http://twitter.com/toniklemm>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> On Sep 10, 2018, at 4:01 PM, Mateus da Silva Teixeira <
>>> mateusstex at gmail.com> wrote:
>>>
>>> Sorry about grammatical error: ... not *be more* specific.
>>>
>>> Best regards,
>>>
>>> Mateus
>>>
>>>
>>> Em seg, 10 de set de 2018 às 17:57, Mateus da Silva Teixeira <
>>> mateusstex at gmail.com> escreveu:
>>>
>>>> Hi Toni,
>>>>
>>>> Thank you for your reply.
>>>>
>>>> Sorry for not being more specific. Actually, I have more than 30 GRIB
>>>> 1/2 files and I would like to define a single variable (with new function)
>>>> to hold data from all files. Part of these files are in GRIB 1 format and
>>>> other part is in GRIB 2. Also, variable name changes from GRIB 1 to GRIB 2
>>>> format, even the files coming from same source (GFS ANL). So, I want, after
>>>> working with these differences, to put all data into the same array.
>>>>
>>>> Thanks,
>>>>
>>>> mateus
>>>>
>>>>
>>>> Em seg, 10 de set de 2018 às 17:47, Toni Klemm <toni-klemm at tamu.edu>
>>>> escreveu:
>>>>
>>>>> Hi Mateus,
>>>>>
>>>>> I imagine there are more elegant ways, but if you don’t have too many
>>>>> files (or if they have the same variable type (int, float, …), you can run
>>>>> the command
>>>>>
>>>>> ncdump -h file/path/and/filename.nc
>>>>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__filename.nc&d=DwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=WsLJ5ywbW3XnTzqo_ETV62H6s1a5bcGgnrpl7xPRfic&m=QNHQY-Rg2SD7O4tjt83KFOLSP78h3Xsi7Gp8DZC4XjQ&s=nGgX5SBhjflILx1upQjtPTbXH-SW2BKF3RylaoX5oeM&e=>
>>>>>
>>>>> which will give you the metadata to each variable, and copy-paste the
>>>>> _FillValue value of your variable directly into your NCL script. Another
>>>>> way is to view the file in a viewer like Panoply and get the _FillValue
>>>>> that way.
>>>>>
>>>>> Hope that helps,
>>>>> Toni
>>>>>
>>>>>
>>>>>
>>>>> *Toni Klemm, Ph.D.*Postdoctoral Research Associate
>>>>> Department of Ecosystem Science and Management
>>>>> College of Agriculture and Life Sciences
>>>>> Texas A&M University, College Station, TX
>>>>> Contributor to the Early Career Climate Forum
>>>>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.eccforum.org&d=DwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=WsLJ5ywbW3XnTzqo_ETV62H6s1a5bcGgnrpl7xPRfic&m=QNHQY-Rg2SD7O4tjt83KFOLSP78h3Xsi7Gp8DZC4XjQ&s=QUEh_u_3pzFgPJlCLTXhCDGj-D3g91zg-BqeSy81OCs&e=>
>>>>> www.toni-klemm.de
>>>>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.toni-2Dklemm.de&d=DwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=WsLJ5ywbW3XnTzqo_ETV62H6s1a5bcGgnrpl7xPRfic&m=QNHQY-Rg2SD7O4tjt83KFOLSP78h3Xsi7Gp8DZC4XjQ&s=VU_wO4xhSNGiMrxkh2cdBDlVDCFdstJTeeISiPDr1zs&e=>
>>>>>  | @toniklemm
>>>>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__twitter.com_toniklemm&d=DwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=WsLJ5ywbW3XnTzqo_ETV62H6s1a5bcGgnrpl7xPRfic&m=QNHQY-Rg2SD7O4tjt83KFOLSP78h3Xsi7Gp8DZC4XjQ&s=vCNxBBWrfi20WfSVT8WwtxB8Z5Y1OLH3Am8YgLAefPs&e=>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Sep 10, 2018, at 3:34 PM, Mateus da Silva Teixeira <
>>>>> mateusstex at gmail.com> wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>> Is there a way to get _FillValue attribute from a file variable
>>>>> without loading that variable?
>>>>>
>>>>> I found *getFillValue* function, but I think it won't work like I
>>>>> expect. Also, function *getfilevaratts* only gives a list of the
>>>>> attributes. I would like to directly access the content of this attribute.
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Mateus
>>>>>
>>>>> _______________________________________________
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>>>>>
>>>>>
>>>>>
>>>
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