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

Fri Sep 24 08:56:26 MDT 2021

Francesco, I am not familiar with PyNGL versions.  I hope someone from
official PyNGL support can advise you about this.

On Fri, Sep 24, 2021 at 7:04 AM Francesco Trotta <francesco.trotta4 at unibo.it>
wrote:

> 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> 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>
>
> 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> 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> 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> wrote:
>
> Not that I know.
>
>
> On Jan 28, 2020, at 4:12 AM, Francesco Trotta via ncl-talk <
> 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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