[ncl-talk] Calling binary files
Arka Banerjee
arka354deb at gmail.com
Wed Dec 20 23:31:22 MST 2017
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
> >
> > _______________________________________________
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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
>
> !-----------------------------------------------------------
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