[Numpy-discussion] Multiple Boolean Operations
Stéfan van der Walt
Thu May 22 12:26:33 CDT 2008
2008/5/22 Andrea Gavana <firstname.lastname@example.org>:
>> You clearly have a large dataset, otherwise speed wouldn't have been a
>> concern to you. You can do your operation in one pass over the data,
>> and I'd suggest you try doing that with Cython or Ctypes. If you need
>> an example on how to access data using those methods, let me know.
>> Of course, it *can* be done using NumPy (maybe not in one pass), but
>> thinking in terms of for-loops is sometimes easier, and immediately
>> takes you to a highly optimised execution time.
> First of all, thank you for your answer. I know next to nothing about
> Cython and very little about Ctypes, but it would be nice to have an
> example on how to use them to speed up the operations. Actually, I
> don't really know if my dataset is "large", as I work normally with
> xCent, yCent and zCent vectors of about 100,000-300,000 elements in
Just to clarify things in my mind: is VTK *that* slow? I find that
surprising, since it is written in C or C++.
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