[Numpy-discussion] python numpy code many times slower than c++
Neal Becker
ndbecker2 at gmail.com
Wed Jan 21 10:38:44 EST 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
Do you know if this code will work with strided vectors? If I pass a slice:
u = array (...)
F (u[::2])
What happens?
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