[Numpy-discussion] ownership of numpy arrays
setthiry at hotmail.com
Wed Jan 17 04:54:27 CST 2007
I am working on a project where I am doing some interfacing with numpy
arrays at a C level.
One thing that I want to do (using pyrex) is to call numpy functions, then
directly access the underlying double * array of the resulting ndarray and
operate on it in C/pyrex (I don't want to copy it). I want to ensure that
the underlying double * wont be deallocated until I'm ready. I was going to
take the resulting ndarray and set the ownership bit of the result to 0 and
then I would be responsible for deallocating the memory when I was ready.
Contrary to what I expected I noticed that it seems all numpy functions, for
example numpy.linalg.pinv as well as numpy.linalg.eig return matrices that
don't own their data.
(If m is a numpy array)
shows that n does not own its data.
So I can't take their underlying data * with any certaintly that it won't be
deallocated before I'm ready. If n doesn't own its data, who does. Is there
a safe way to do what I want?
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