Thomas Hrabe wrote:
One can find multiple approaches to arrays, the old numeric array and the new ndarray. The new stuff seems to be backward compatible.
mostly, yes. numpy (ndarray) is the only option going forward, as it's the only one being maintained.
However, where is a free documentation of the ndarray?
You are right, the most complete set is Travis' book. It's a pretty good deal when you consider that he wrote much of numpy -- if it saves you an hour, it's worth the money! That being said, I think you were pointed to: http://projects.scipy.org/scipy/numpy/wiki/NumPyCAPI Which should get you going, though it does seem to be missing your key question:
Which headers do I have to use in order to access the ndarray object that, in my eyes, should be compatible wit PyObject in some way?
#include <numpy/arrayobject.h> You should use distutils to compile your extension, and in your setup.py, you can put: include_dirs=[numpy.get_include()] and the header should be found.
run in C should look like this: PyObject run{ PyObject* ndArray; PyArg_ParseTuple( argv, ???? ,ndArray);
I think you had that right before -- you were just using the wrong headers: PyArg_ParseTuple(args, "O!",&PyArray_Type, &array)
Is it possible to access the ndarray object like this?
yes, something like that certainly should work. When you've got it worked out, please add it to the Wiki. I'd poke around the wiki, and this mailing list archives, for more examples. NOTE: Most folks now think that the pain of writing extensions completely by hand is not worth it -- it's just too easy to make reference counting mistakes, etc. Most folks are now using one of: Cython (or Pyrex) SWIG ctypes For example, the SWIG typemaps distributed with numpy make it very easy to pass a numpy array into a C function such as: void MyFunc(int i, int j, int k, double *arr) where *arr is a pointer to a block of doubles that represent an (i,j,k) 3-d array. Equally easy methods are available with Cython and ctypes. -Chris -- Christopher Barker, Ph.D. Oceanographer 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 Chris.Barker@noaa.gov