[Numpy-discussion] python numpy code many times slower than c++

Neal Becker ndbecker2@gmail....
Wed Jan 21 09:22:36 CST 2009

Ravi wrote:

> Hi Neal,
> On Wednesday 21 January 2009 07:27:04 Neal Becker wrote:
>> It might if I had used this for all of my c++ code, but I have a big
>> library of c++ wrapped code that doesn't use pyublas.  Pyublas takes
>> numpy objects from python and allows the use of c++ ublas on it (without
>> conversion).
>> Most of my code doesn't use numpy, it uses plain ublas to represent
>> vectors, and ublas handles storage.  I can only interface to/from numpy
>> with conversion.
> I pointed out my code to you on c++-sig[1] a while back that solves
> precisely this problem. You found a bug with memory management that I
> fixed in the updated code. Does that still not work for you?
> Regards,
> Ravi
> [1]
> [http://mail.python.org/pipermail/cplusplus-sig/2008-October/013825.html
Thanks for reminding me about this!

Do you have a current version of the code?  I grabbed the files from the 
above message, but I see some additional subsequent messages with more 

More information about the Numpy-discussion mailing list