[ncl-talk] R: NCAR graphic library in Julia language?

[Francesco Trotta]

Dear Dave
I'm try to install pyNGL library on my Debian 10 with conda:

conda install -c conda-forge pyngl


But I get this error:

"""
This can take several minutes.  Press CTRL-C to abort.
failed

UnsatisfiableError: The following specifications were found
to be incompatible with the existing python installation in your environment:

Specifications:

  - pyngl -> python[version='2.7.*|>=2.7,<2.8.0a0|>=3.6,<3.7.0a0|>=3.8,<3.9.0a0|>=3.7,<3.8.0a0|>=3.5,<3.6.0a0']

Your python: python=3.9

If python is on the left-most side of the chain, that's the version you've asked for.
When python appears to the right, that indicates that the thing on the left is somehow
not available for the python version you are constrained to. Note that conda will not
change your python version to a different minor version unless you explicitly specify
that.

The following specifications were found to be incompatible with your system:

  - feature:/linux-64::__glibc==2.28=0
  - pyngl -> libgcc-ng[version='>=7.3.0'] -> __glibc[version='>=2.17']
  - python=3.9 -> libgcc-ng[version='>=9.3.0'] -> __glibc[version='>=2.17']

Your installed version is: 2.28
"""


Do you know how can I solve this problem?
I've installed python 3.9.5 on my machine. Is pyNgl supported for this version?

Best
Francesco
________________________________
Da: Dave Allured - NOAA Affiliate <dave.allured at noaa.gov>
Inviato: giovedì 30 gennaio 2020 21:27
A: Francesco Trotta <francesco.trotta4 at unibo.it>
Cc: ncl-talk at ucar.edu <ncl-talk at ucar.edu>
Oggetto: Re: [ncl-talk] NCAR graphic library in Julia language?

Franz,

Originally you asked about calling NCAR Graphics.  NCL is a different system that uses NCAR Graphics internally.  The only way to call NCL right now is through a shell function like "run" which you said you are using.  You might be able to improve efficiency by using environment variables to pass data.

It would be good to have a direct interface to call NCL from other languages, so that you can efficiently send and receive data.  Currently there is no such NCL interface for any language.  However, an NCL main program can call C and fortran routines by using a wrapper facility.  This is not of much help for calling NCL from Julia.

http://www.ncl.ucar.edu/Document/Manuals/Ref_Manual/NclExtend.shtml


On Thu, Jan 30, 2020 at 3:40 AM Francesco Trotta <francesco.trotta4 at unibo.it<mailto:francesco.trotta4 at unibo.it>> wrote:
Dear Dave,
   thanks for the informations!
   Up to now in my julia program for some tasks (like represent vector fields, ...) I'm calling ncl scripts from julia with the 'run' function (command for Running External Programs similar to NCL's systemfunc())

   I still have to try to import the PyNGL library but I will try it!

   I know that in julia you can import other library build in other language
   (for example my colleague use the python visualization PyPlot and Seaborn library)

   I'm not expert but perhaps you need a wrapper to use an external library ...

thanks

Francesco

________________________________
Inviato: mercoledì 29 gennaio 2020 19:46
A: Francesco Trotta <francesco.trotta4 at unibo.it<mailto:francesco.trotta4 at unibo.it>>

Oops.  I meant to say, "This would also depend on whether the NCAR Graphics runtime system is compatible with the Julia runtime system."

Also you might consider calling PyNGL, the NCAR Graphics Python interface, directly from Julia.  One again, there would be runtime compatibility concerns.  These may be uncharted waters.


On Wed, Jan 29, 2020 at 11:37 AM Dave Allured - NOAA Affiliate <dave.allured at noaa.gov<mailto:dave.allured at noaa.gov>> wrote:
Ah.  Here we go.  The Julia home page, https://julialang.org, says "... you can easily use libraries from Python, R, C/Fortran, C++, and Java."

So theoretically you should be able to use either the C or Fortran interface to NCAR Graphics, or even mix them.  This would also depend on whether the NCL runtime system is compatible with the Julia runtime system.  This would be worth testing.  If you try anything like this, let us know what happens.  Thanks.


On Tue, Jan 28, 2020 at 10:53 AM Dave Allured - NOAA Affiliate <dave.allured at noaa.gov<mailto:dave.allured at noaa.gov>> wrote:
Franz, NCAR Graphics has C and fortran interfaces.  But I do not know anything about Julia.  Are any of these options possible?

* Julia calls C.
* Julia calls fortran.
* Julia calls a command shell, like NCL's systemfunc().


On Tue, Jan 28, 2020 at 6:46 AM Dennis Shea via ncl-talk <ncl-talk at ucar.edu<mailto:ncl-talk at ucar.edu>> wrote:
Not that I know.


On Jan 28, 2020, at 4:12 AM, Francesco Trotta via ncl-talk <ncl-talk at ucar.edu<mailto:ncl-talk at ucar.edu>> wrote:

Dear NCL-users
   I'm working with a code written in Julia program language
   Is there a way to import and use the NCAR graphic library in Julia language?

Best
Franz
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