What version of numpy are you using? IIRC the new buffer protocol has been supported since numpy 1.5.
On 17 December 2011 08:42, Soeren Sonnenburg <so...@debian.org> wrote: > Doesn't work, complaining that the object has no __buffer__ attribute. > > Digging into the numpy c code it seems numpy doesn't even support the > buffer protocol but only the deprecated (old) one > http://docs.python.org/c-api/objbuffer.html . > > At least there is nowhere a PyObject_CheckBuffer() call but frombuffer > in the numpy C code checks for > > (Py_TYPE(buf)->tp_as_buffer->bf_getwritebuffer == NULL > && Py_TYPE(buf)->tp_as_buffer->bf_getreadbuffer == NULL) > > . > > So it needs bf_read/writebuffer to be set instead of bf_getbuffer and the > array buffer protocol :-( > > Soeren > > On Sat, 2011-12-17 at 03:20 +0100, Torgil Svensson wrote: >> What happens if you use >> >> y=numpy.frombuffer(x) ? >> >> //Torgil >> >> >> On Sat, Dec 17, 2011 at 1:41 AM, Soeren Sonnenburg <so...@debian.org> wrote: >> > Hi, >> > >> > I've implemented the buffer protocol >> > (http://www.python.org/dev/peps/pep-3118/) for some matrix class and >> > when I manually call PyObject_GetBuffer on that object I see that I get >> > the right matrix. >> > >> > Now I'd like to see numpy use the buffer protocol of my class. Does >> > anyone know how to test that? What do I need to write, just >> > >> > x=MyMatrix([1,2,3]) >> > y=numpy.array(x) >> > >> > (that doesn't call the buffer function though - so it must be sth else)? >> > >> > Any ideas? >> > Soeren >> > -- >> > For the one fact about the future of which we can be certain is that it >> > will be utterly fantastic. -- Arthur C. Clarke, 1962 >> > >> > _______________________________________________ >> > 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 >> > > -- > For the one fact about the future of which we can be certain is that it > will be utterly fantastic. -- Arthur C. Clarke, 1962 > > _______________________________________________ > 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
