[ncl-talk] Calling binary files

Wed Dec 20 23:54:24 MST 2017

Awesome, thanks!

So for this a do loop is required?

Arka

On Dec 21, 2017 12:22, "Barry Lynn" <barry.h.lynn at gmail.com> wrote:

> Hi:
>
> Here is what you need (example)
>
>  DATADir = "/data1/wrf/NAM/"
>
>   diri = DATADir  ; you can add "+ date" if you have files listed in
> directories by date.
>
>  all_files = systemfunc("ls " + diri + "nam*grb")
>
>  print("all_files = " + all_files)
>
>  n_files = dimsizes(all_files)
>
>  print("n_files = " + n_files)
>
> ;do n=0,n_files -1,1
>
>
>  do n=12,14
>
>    print("all_files(n) = " + all_files(n))
>
>    filename = all_files(n)
>
>    print ("filename" + filename)
>
>    a = addfile(filename,"r")
>
> On Thu, Dec 21, 2017 at 8:31 AM, Arka Banerjee via ncl-talk <
> ncl-talk at ucar.edu> wrote:
>
>> If one write the following line what does it mean?
>>
>> Fn=(/"day1.dat","day2.dat","day3.dat","day4.dat"/)
>>
>> The above line is not mean that all dat file names are concatenate in
>> variable Fn?
>> I required the same thing for 100 files but without manually putting the
>> file name.
>>
>> That was the question.
>>
>> Thanks,
>> Arka
>>
>> On Dec 21, 2017 01:37, "Dennis Shea" <shea at ucar.edu> wrote:
>>
>> @Arka: Please read the
>>
>> https://www.ncl.ucar.edu/Document/Manuals/
>>
>>
>>    - NCL User Guide, V1.1
>>    <https://www.ncl.ucar.edu/Document/Manuals/NCL_User_Guide>
>>    - Mini-Language (pdf)
>>    <https://www.ncl.ucar.edu/Document/Manuals/language_man.pdf>
>>
>> ====================================
>> NCL does allow a user to specify a *variable *which spans multiple
>> netCDF, grib or HDF files to (effectively) be concatenated via *addfiles
>> *and the appropriate* ListSetType *options.
>> *NOTE: the files are not concatenated ....only the specified variable.*
>> https://www.ncl.ucar.edu/Document/Functions/Built-in/addfiles.shtml
>> https://www.ncl.ucar.edu/Document/Functions/Built-in/ListSetType.shtml
>>
>> =====
>> There is *no *explicit NCL function which concatenates *binary* or *text*
>> (ascii)* files*.
>> Please Read: https://www.ncl.ucar.edu/Applications/r-binary.shtml
>>
>> ===
>> Some options:
>>
>> [1] On the {U/Li}nix command line:
>>
>> %> *cat* LocalBinaryFiles*dat *>!* BigBinary.dat
>>
>> The *!* will overwrite 'BigBinary.dat' if the file currently exits.
>>
>> Depending on the binary file type, use:
>>
>>     Direct Access:            data = *fbindirread* <https://www.ncl.ucar.edu/Document/Functions/Built-in/fbindirread.shtml>("BigBinary.dat",rec,dim,type)
>>
>>     Sequential Access:        data = *fbinrecread* <https://www.ncl.ucar.edu/Document/Functions/Built-in/fbinrecread.shtml>("BigBinary.dat",rec,dim,type)
>>
>> *Please read* the documentation for these function:
>>
>> http://www.ncl.ucar.edu/Document/Functions/Built-in/fbindirread.shtml
>> http://www.ncl.ucar.edu/Document/Functions/Built-in/fbinrecread.shtml
>>
>> also, binary files could be '*BigEndian*" or '*LittleEndian**. *The following allows you to specify
>>
>> http://www.ncl.ucar.edu/Document/Functions/Built-in/isbigendian.shtml
>>
>>  if (*isbigendian*() ) then   ; is local machine big or little endian?
>>      *setfileoption* <http://www.ncl.ucar.edu/Document/Functions/Built-in/setfileoption.shtml>("bin","ReadByteOrder","LittleEndian")
>>  end if
>>
>>  x = *fbindirread*(...)
>>
>> or
>>
>>  c = *fbinrecread*(...)
>>
>> Sfter you are finished, you may want to delete the 'BigBinary.dat' file
>>
>> %> rm BigBinary.dat
>>
>> Or, perhaps the individual binary files and keep the concatenated file:
>>
>> %> rm LittleBinary*dat
>>
>>
>> [2]
>>
>> diri = ".../"    ; input dir
>>
>> if (*.not.fileexists*("BigBinary.dat")) then
>>
>>     system("cat LocalBinary*dat >! "BigBinary.dat")
>>
>> end if
>>
>>
>>     Direct Access:            data = *fbindirread* <https://www.ncl.ucar.edu/Document/Functions/Built-in/fbindirread.shtml>("BigBinary.dat",rec,dim,type)
>>
>>     Sequential Access:        data = *fbinrecread* <https://www.ncl.ucar.edu/Document/Functions/Built-in/fbinrecread.shtml>("BigBinary.dat",rec,dim,type)
>>
>>
>>
>>
>>
>>
>>
>>
>> On Wed, Dec 20, 2017 at 10:27 AM, Laura Fowler via ncl-talk <
>> ncl-talk at ucar.edu> wrote:
>>
>>> Hi Arka:
>>>
>>> I usually use systemfunc, followed with ListSetType, and then addfiles
>>> to read a bunch of the same kind of files together. There are lots of
>>> examples on how to use systemfun on the ncl web site.
>>>
>>> Hope this helps,
>>> Laura
>>>
>>>
>>> On Wed, Dec 20, 2017 at 9:13 AM, Arka Banerjee via ncl-talk
>>> <ncl-talk at ucar.edu> wrote:
>>> > Hi all,
>>> >
>>> > How to concatenate all file names in a single variable in NCL? I have
>>> 100 of
>>> > .dat files in a directory and I want to call them all in a variable
>>> like
>>> > below;
>>> >
>>> > fn=(/"gsmap_nrt.20100805.0600.dat","gsmap_nrt.20100805.0900.dat"/)
>>> >
>>> > So that 'fn' will be re-structured for 100 of .dat files in the same
>>> way of
>>> > above line.
>>> >
>>> >
>>> > How to execute this thing? Function 'addfiles' helps in this case? As
>>> I have
>>> > found it is not for ascii formate.
>>> >
>>> >
>>> > Thanks,
>>> >
>>> > Arka
>>> >
>>> > _______________________________________________
>>> > ncl-talk mailing list
>>> > ncl-talk at ucar.edu
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>>> >
>>>
>>>
>>>
>>> --
>>> !-----------------------------------------------------------
>>> --------------------------------------------------
>>> Laura D. Fowler
>>> Mesoscale and Microscale Meteorology Division (MMM)
>>> National Center for Atmospheric Research
>>> P.O. Box 3000, Boulder CO 80307-3000
>>>
>>> e-mail: laura at ucar.edu
>>> phone: 303-497-1628
>>>
>>> !-----------------------------------------------------------
>>> --------------------------------------------------
>>> _______________________________________________
>>> ncl-talk mailing list
>>> ncl-talk at ucar.edu
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>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>
>>
>>
>>
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>>
>
>
> --
> Barry H. Lynn, Ph.D
> Senior Lecturer,
> The Institute of the Earth Science,
> The Hebrew University of Jerusalem,
> Givat Ram, Jerusalem 91904, Israel
> Tel: 972 547 231 170
> Fax: (972)-25662581
>
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