Re: [Opencfd-develop] scripting vs library

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--- Anton Kulchitsky <an...@ku...> wrote:

> Hi Jinming,
> 
> It is really good to find some parser and all these
> stuff somewhere. 
> Well, all script languages you are talking about are
> general script 
> languages and they are fine. However, we still need
> to add some specific 
> commands to it, do not we? Then, we have to write
> parsers and so on... 

No parser at all. Only data conversion is needed! You
can take a look at
http://docs.python.org/ext/ext.html.

> Oh! I see you did it already :)
> 
> Probably, this is excellent. And your point of view
> is correct (your 
> script is very nice, so I appreciated). But what do
> you think about 
> library + frontend? So, the library (or kernel) and
> special 
> graphical/sciptable system above it. Well, probably
> I have to wait for 
> any developers docs  before any ideas :)) Sorry,
> guys. Maybe it looks 
> like this already. :)

We will still need a GUI, frontend in your words, for
the stand-alone or the library. As an alternative, we
can also keep it as a library. Once the code is ready,
actually a library is not far away from a stand-alone.

> 
> ---
> 
> Thank you for CGNS. I am studying it now.
> 
> Anton
> 
> Jinming Xu wrote:
> 
> >> From: Anton Kulchitsky <an...@ku...>
> >> To: Jinming Xu <jin...@ms...>
> >> Subject: mail list etc.
> >> Date: Tue, 24 Aug 2004 13:15:39 -0800
> >>
> >> Jinming,
> >>
> >>> (1) Regarding the GUI, you can discuss with
> dano, one of the 
> >>> developers of OpenCFD. You two can take charge
> of it. I have no 
> >>> strong opinion of any particular GUI. What I
> said may not be correct 
> >>> and I don't stick with it. Let the hands-on
> developers decide.
> >>
> >>
> >> Do you have a mail list? Probably, we could
> discuss it together.
> >>
> >>>
> >>> (2) Regarding the stand-alone and library, you
> are only partially 
> >>> right. The stand-alone you are talking about is
> not programmable. 
> >>> The new version of OpenCFD will be programmable,
> or say scriptable. 
> >>> So it's not merely a stand-alone, it's also a
> server, or a library. 
> >>> You can use simple commands (macro) to control
> it. All the 
> >>> commercial CFD software is like this.
> >>
> >>
> >> I mostly agree. However, it is hard to develop a
> good script (or find 
> >> a good one, that is IMHO better). Even more
> however ;), we are very 
> >> different from commercial software. They chose
> this way (of 
> >> stand-alone monsters with OS like behaviour)
> mostly because they are 
> >> "close-source" and it is much more convenient for
> them to give some 
> >> kind of enviroment for users. For an open-source
> projects it is very 
> >> big advantage if the project is a library (open!)
> plus some gui 
> >> scriptable interface above the library, some kind
> of front-end. Thus, 
> >> we leave a choice for users what to use.
> >
> >
> > Why do you think there is no good script to
> choose? From Tcl, Python 
> > to Scheme, these scripting languages are widely
> used in commercial as 
> > well as open-source codes. I once saw some
> open-source CFD codes use 
> > scripting languages too.
> >
> > The big advantage of scripting is the easy of use,
> both in terms of 
> > the labor involved and the skills required. In the
> sense of skills 
> > involved, library approach will be very hard for
> users who are not 
> > developers. Without scripting, you have to compile
> each time for each 
> > job, but with script, all this can be done in a
> single script without 
> > compilation.
> >
> > Here is a sample script for OpenCFD 0.3 to
> generate a grid:
> > # --------------- Tutorial Script
> ------------------------
> > # A very preliminary script for OpenCFD to
> generate a grid
> > # For more info, please refer to the doc or visit
> http://opencfd.sf.net
> > # All Rights Reserved!  Jinming Xu jx...@op...
> > import geom
> > geom.get("rub.dxf")
> > geom.shrink([6.0])
> > import grid
> > grid.cart(30,25)
> > grid.addExtrLayer(3,0.8)
> > grid.save("2d-bas.cgns")
> >
>
#--------------------end---------------------------------------------
> >
> >> That is why I am talking about free library
> rather than an 
> >> application like Matlab or Mathematica. I think
> Octave is not 
> >> succeeded very much because they tried to be
> similar to Matlab. But 
> >> GSL (GNU scientific library) succeeded much
> better due to they are 
> >> different but still cover same tasks.
> >>
> >>
> >> I do not mean that my opinion is better. It is my
> point of view as a 
> >> user of a library and model developer. I think
> this is a kind of 
> >> "UNIX-way": we have components (libraries) and we
> have fron-ends and 
> >> UI if users need them. This is something
> different from commercial 
> >> way, but it looks more attractive for me.
> Finally, this software is 
> >> for advanced users or even for programmers
> (script or FORTRAN 
> >> programmers at least), so the library could be
> very attractive for 
> >> them still.
> >>
> >>>
> >>> (3) Yes Latex files are much better than .docs.
> We can made this 
> >>> change. Actually all the doc included in the tar
> ball is in latex.
> >>
> >>
> >> Sounds just fine.
> >>
> >> Anton
> >
> >
> >
>
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=== message truncated ===

=====
Jinming Xu
PhD Student
Mechanical Engineering Dept, Texas A&M University

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