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 > -- 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