Re: [Visualpython-users] Experimental Windows version for Python 2.4

[Bruce S. <Bru...@nc...>]

The Windows version available at vpython.org does not at the moment 
include/install Numarray, just Numeric. But if you install Numarray 
yourself, the behavior will be as Jonathan describes and has implemented.

Bruce Sherwood

Jonathan Brandmeyer wrote:

> On Tue, 2004-12-28 at 11:48 -0500, Bruce Sherwood wrote:
> 
>>Now available at vpython.org is an experimental version of VPython for 
>>Python 2.4 on Windows. The only known bug is that programs that use the 
>>"text" module to display block letters (including the demo programs 
>>stonehenge.py and texttest.py) fail on some but not all computers. We 
>>would appreciate feedback on this or other bugs you may find. This was 
>>built using the new Boost-based package created by Jonathan Brandmeyer.
>>
> 
> 
> 
> There is one additional change that this release has versus prior
> releases that used Boost.Python for its bindings.  This build supports
> and includes both Numeric 23.6 and Numarray 1.1.1.
> 
> By default, executing "from visual import *" will bring in Numeric, and
> not Numarray, and will use Numeric arrays to hold the data of curves,
> convex, and faces objects.  You can alter this behavior by calling the
> function set_array_backend() with either the string "numeric" or
> "numarray".  To be safe, you should only do this once at the beginning
> of your program, before creating any array-using objects.  If you are
> forcing the use of Numarray in this way, you must also run "from
> numarray import *".  It is not safe to change the backend after you have
> created a visual object that uses an array (even if its pos, color, or
> normal attribute appears to be empty).
> 
> Alternatively, you can edit site-packages/visual/__init__.py (lines
> 16-23) to change the preference for all applications on your particular
> installation.
> 
> I intend to provide support for Numeric as long as it is supported
> upstream and not too much of a burden on Visual.  Numarray has very good
> backwards compatibility with Numeric, and Visual's core works exactly
> the same with both.  However, there are some differences which you may
> see in your own programs (some of our demos are also affected).  So,
> Visual will prefer Numeric by default rather than Numarray, for maybe 6
> months to a year, depending on feedback from you and the development of
> Numeric/Numarray.
> 
> -Jonathan Brandmeyer
> 
> P.S.  The source package for Linux and OSX will be released soon (to be
> versioned 3.1.0).  I am working out a few kinks in the configuration and
> build control files.
> 
> 
> 
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