Re: [Visualpython-users] vpython and ipython

[Venkat R. <ven...@gm...>]

Bruce,

Thanks for the helpful info.

In fact, I'm using numpy arrays similar to the VPython examples to
update pos/axis.

I installed VIDLE and that works for me as well. I don't know if I can
fix the issues with ipython, but I'll try.

Thanks again,
Venkat.

On Tue, Dec 22, 2009 at 11:26 AM, Bruce Sherwood
<Bru...@nc...> wrote:
> I apologize for not responding to your earlier question about vectors. The
> Visual "vector" is designed to mimic the properties of 3D vectors used in
> math and science (add, subtract, magnitude, dot and cross product, etc.).
> The numpy module provides a very large number of structures and operations
> on arrays, which makes it possible to do scientific processing in Python
> where using lists would be unbearably slow. One uses Visual vectors for
> describing positions of Visual objects, and general geometric calculations
> related to 3D displays. The VPython example programs gas.py and stars.py are
> examples of the use of numpy arrays for doing numerical integrations of
> motion for many objects in single array statements.
>
> I've never used ipython and don't know what the problem is (I've only used
> IDLE or the more recent VIDLE). I would guess that the problem is with
> Visual, not with ipython, but I don't know. If you're willing to delve into
> Visual to see what the problem is (and maybe fix it), great!
>
> Bruce Sherwood
>
> Venkat Ramanan wrote:
>
> Hi all,
>
> Thanks for the visual link. I've previously used VTK using Octaviz,
> which is an Octave interface to VTK. Octaviz is very easy to use,
> makes good plots. But animations using it is slow, many primitives
> like 3D-arrows are limited in functionality and sadly Octaviz is not
> being developed anymore, as far as I know. It is not even present in
> the 9.10 Ubuntu repositories.
>
> In general, VTK has a lot of options, but needlessly complicated for
> me. On the other hand, vpython is simple to setup and fast. It
> basically took only a few minutes to get the basics of it.
>
> BTW, regarding issue 1b of my original post, I was stupidly calling
> display every time the script was run. If I don't call it, it reuses
> the last display and it is fine.
>
> Can someone please comment on the remaining issues?
>
> 1. vector() versus numpy array differences? Basically what is better
> to use and why?
>
> 2. If only I can get ipython to play nice with vpython, I'm basically
> all set. Is it something on the ipython side or in vpython?
> I can hack something together, if there are some pointers.
>
> Thanks,
> Venkat.
>
> PS: I meant to send the reply to the list, but it was mistakenly sent
> personally to Guy Kloss.
>
> On Sat, Dec 19, 2009 at 2:52 PM, Guy K. Kloss <g....@ma...> wrote:
>
>
> On Sun, 20 Dec 2009 04:13:58 James Mueller wrote:
>
>
> Again, I haven't tried it, so I can't offer any review of it.
>
>
> I can somewhat help out there ...
>
> I've tested that Visual module. It's somewhat more geared towards the Visual
> 3.x API, it's *quite* a bit slower than visual, and it's not as feature
> rich.
> Also there are some draw backs due to bugs/limitations in the traits
> implementation limiting the range of usable sizes, etc. Some code also has
> to
> be (slightly) adapted to fit that visual API of Mayavi.
>
> Performance can be somewhat boosted significantly by switching to the Qt4
> backend over the default wx windowing backend. Still, performance is not
> nearly as good as with Visual Python.
>
> I did a presentation with a paper at the last Kiwi PyCon touching this
> topic.
> The slides are here:
>
> http://www.slideshare.net/XEmacs/python-data-plotting-and-visualisation-
> extravaganza
>
> A paper of that is soon to be published under the Python Papers Monograph
> Series for that: http://pythonpapers.org
>
> Guy
>
> --
> Guy K. Kloss
> Institute of Information and Mathematical Sciences
> Te Kura Pūtaiao o Mōhiohio me Pāngarau
> Massey University, Albany (North Shore City, Auckland)
> 473 State Highway 17, Gate 1, Mailroom, Quad B Building
> voice: +64 9 414-0800 ext. 9585   fax: +64 9 441-8181
> G....@ma... http://www.massey.ac.nz/~gkloss
>
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