2009/7/30 Raymond de Vries <ree...@zonnet.nl>:
> Hi,
>
> I'm sorry, I guess I did not search properly before.... For the record,
> I solved my import_array() question: just need to add
> %init %{
> import_array();
> %}Indeed, the solution is as simple as this ;) The trouble is to find the information! > and the typemap for the std::vector<double> works ok. Thanks for that! You're welcome. > Now the rest... > > Thanks > Raymond > > > Raymond de Vries wrote: >> Hi Matthieu, >> >> Thanks for your quick reply! I did not find this page earlier. I have >> studied the first page and now I realize again that all my efforts so >> far (last few days) have crashed on the lack of calling import_array(). >> Do you have a suggestion for calling import_array() as well? Everywhere >> I see *that* import_array() needs to be called, but not how... >> >> I will take a look at the conversion to a single vector. I hope this can >> be avoided because I cannot simply change the library. >> >> regards >> Raymond >> >> >> Matthieu Brucher wrote: >> >>> Hi, >>> >>> In fact, it's not that complicated. You may know the way how copying a >>> vector, and this is all you need >>> (http://matt.eifelle.com/2008/01/04/transforming-a-c-vector-into-a-numpy-array/). >>> You will have to copy your data, it is the safest way to ensure that >>> the data is always valid. >>> For the std::vector<>[], I suggest you convert it to a single vector, >>> as the data inside this "array" is not contiguous and it can thus be >>> cumbersome to create a Numpy array from that. >>> >>> Once the structure is prepared, you have to allocate the dimensions, >>> but this may be available online. >>> >>> In case you know that the C++ data won't go away before the Python >>> array, you can always wrap the container >>> (http://matt.eifelle.com/2008/11/04/exposing-an-array-interface-with-swig-for-a-cc-structure/) >>> with SWIG. >>> >>> Matthieu >>> >>> 2009/7/30 Raymond de Vries <ree...@zonnet.nl>: >>> >>> >>>> Hi everyone, >>>> >>>> (I sent this message yesterday as well but somehow it didn't come >>>> through...) >>>> >>>> I would like to ask your advice how I can use NumPy to wrap my existing >>>> C++ library with 2-dimensional arrays. I am wrapping the library with >>>> swig and I have the typemap function declaration. But now I am >>>> struggling a lot to find an implementation for getting access to the >>>> 2-dimensional arrays in my C++ classes. I have wrapped most of the >>>> library but the multi-dimensional arrays are problematic. From what I >>>> have read, I can use NumPy for this.. >>>> >>>> There is so much information about NumPy, Numeric etc that it is not >>>> clear anymore which example I can use best. It's clear that NumPy is >>>> probably the way to go. >>>> >>>> This is a small example of the class that I would like to wrap: >>>> struct MyClass { >>>> float array1[2][2]; >>>> std::vector<float> array2[2]; >>>> }; >>>> >>>> I've also read that I need to call import_array() but where should I put >>>> this? >>>> >>>> Is there a small example with NumPy c-api to wrap/convert my >>>> 2-dimensional arrays to python? >>>> >>>> Thanks a lot already >>>> Raymond >>>> _______________________________________________ >>>> NumPy-Discussion mailing list >>>> NumPy-Discussion@scipy.org >>>> http://mail.scipy.org/mailman/listinfo/numpy-discussion >>>> >>>> >>>> >>> >>> >>> >> >> _______________________________________________ >> NumPy-Discussion mailing list >> NumPy-Discussion@scipy.org >> http://mail.scipy.org/mailman/listinfo/numpy-discussion >> >> > > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@scipy.org > http://mail.scipy.org/mailman/listinfo/numpy-discussion > -- Information System Engineer, Ph.D. Website: http://matthieu-brucher.developpez.com/ Blogs: http://matt.eifelle.com and http://blog.developpez.com/?blog=92 LinkedIn: http://www.linkedin.com/in/matthieubrucher _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
