Re: [Visualpython-users] Python 2.5

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

Thanks much, Jonathan. This information is a big help.

Bruce

Jonathan Brandmeyer wrote:

>On Fri, 2006-10-06 at 12:40 -0600, Bruce Sherwood wrote:
>  
>
>>Questions have been asked about Visual for Python 2.5. A significant 
>>hurdle to overcome is that there is not and will not be a version of 
>>Numeric for Python 2.5 (the last to be made was for Python 2.4). Its 
>>successor Numarray does exist for Python 2.5 but is likely to be the 
>>last, as the download instructions say "Use Numpy!"
>>    
>>
>
>The last time that I looked, the Numpy documentation was only available
>for a fee.  That is why Visual was not extended to support it last
>summer.  At any rate, the person(s) who decide to add support for Numpy
>to VPython should see below.
>
>  
>
>> Thanks to Jonathan 
>>Brandmeyer's work, Visual can be compiled for Numarray, but some 
>>existing VPython programs that used explicit Numeric capabilities may 
>>break due to some incompatibilities between Numeric and Numarray.
>>
>>The right thing to do is to revise Visual to use Numpy, which is the 
>>designated to-be-supported replacement for both Numeric and Numarray. I 
>>do not know how much work will be required to do this.
>>    
>>
>
>The revision effort should not be too difficult, as there is an
>abstraction layer for Numeric/Numarray in VPython.  Basically, at
>startup-time, a set of function pointers are initialized that refer to
>either the Numarray or Numeric implementations.  Additionally,
>Boost.Python support for the two libs is selected at run-time.
>
>The affected files are:
>VPython 3.x:
>src/num_util_impl_numeric.cpp
>src/num_util_impl_numarray.cpp
>src/num_util.cpp
>include/num_util_impl.hpp
>include/num_util.hpp
>
>The VPython 4.x files are setup in exactly the same way, except that
>they are found in src/python and include/python.
>
>See also site-packages/visual/array_backend.py in both versions,
>although I think that there is a cleaner way to go about what this file
>does.
>
>Lastly, there are some configure script elements that would need to be
>updated in acinclude.m4 (specifically, VISUAL_NUMERICLIBS).
>
>HTH,
>-Jonathan
>
>
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