[ncl-talk] grib2 to netcdf

[Rick Brownrigg]

HI,

addfiles() returns a *list* of filevars, whereas getfilevarnames expects a
filevar. If you know all the files to be uniform in structure, you could
simple pick one of them, say the first, to get the names:

    names = getfilevarnames(f[0])

Also, see the docs for addfiles():

http://ncl.ucar.edu/Document/Functions/Built-in/addfiles.shtml

It has this advice:

- 1. Whereas *addfile*
<http://ncl.ucar.edu/Document/Functions/Built-in/addfile.shtml> returns a
reference to a single file in a variable of type *file*, *addfiles* returns
a variable of type *list* that contains references, each of type *file*, to
multiple files. This combination of the *list* and *file* types forms a
specialized *list* type. It provides a means of obtaining the aggregated
contents of variables that span the complete list of files.

- 2. It is not yet possible to use the file *list* type variable as input
to the "getfile*xxxx*" suite of functions. However, since each element of
the *list* is actually a *file* type variable, you can input a single
element of the *list* as an argument to any of these functions, e.g.:

  files = *systemfunc*
<http://ncl.ucar.edu/Document/Functions/Built-in/systemfunc.shtml>("ls
*.nc")
  f = *addfiles*(files,"r")
  dsizes = *getfiledimsizes*
<http://ncl.ucar.edu/Document/Functions/Built-in/getfiledimsizes.shtml>(f[0])

-
-

Rick


On Sun, Apr 12, 2020 at 6:54 AM Md. Jalal Uddin via ncl-talk <
ncl-talk at ucar.edu> wrote:

> Hi all,
>
> I hope that you are all well.
>
> I am trying to convert grib2 into netcdf. The problem is to use many files
> together. If I use only one file, it is working fine.
>
> I have tried to use addfiles function here.
>
>   diri = "./"
>    fili = systemfunc("cd "+diri+" ; ls 20180709_0000f*.grib2")
>    f    = addfiles(diri+fili,"r")
>
>    names   = getfilevarnames(f)
>
> print(names)
>
>
> *fatal:*Argument type mismatch on argument (0) of (getfilevarnames) can
> not coerce
>
> Any suggestions would be appreciated. The code has been added herewith.
>
> Best wishes,
> Jalal
> --
> *Md. Jalal Uddin*
> M.Sc. in Applied Meteorology
> Nanjing University of Information, Science and Technology, China.
> B.Sc. in Disaster Management (Hons.)
> Patuakhali Science and Technology University, Bangladesh.
> Cell: +8613260859092, +8801792052662
> Web: www.dmjalal90.weebly.com
> Researchgate: https://www.researchgate.net/profile/Md_Uddin125
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