[Numpy-discussion] Anyone have a well-tested SWIG-based C++ STL valarray <=> numpy.array typemap to share?
Mon Sep 10 11:30:05 CDT 2007
Thanks for you input Xavier.
Xavier Gnata wrote:
> std:valarray are quite strange containers because they are not well
> integrated in the STL.
> I always use vector when I have to deal with arrays.
> ps : There are no real performance differences between vector and
> valarray (in my use cases...)
Probably not for our use cases either. However, we're not doing a lot of
STL either, so I'm not sure there is any downside to valarray. It looks
like neither one supports any kind of "view" semantics, so for the
purposes of numpy array wrapping, they really aren't any different.
On the other hand, I don't know if any of the other common array
implementations do either -- boost::multiarray, blitz++, etc.
So I guess we just need to copy data s we move back and forth (which may
not even be a problem -- we haven't gotten it working yet, so have no
idea if there are any performance issues for us)
A nice numpy-array compatible array for C++ would be nice -- but I know
I'm not going to write it!
Christopher Barker, Ph.D.
Emergency Response Division
NOAA/NOS/OR&R (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception
More information about the Numpy-discussion