On 8-Oct-09, at 6:47 PM, Robert Kern wrote:

On Thu, Oct 8, 2009 at 17:28, David Warde-Farley wrote:

...

I'm trying to use PyArray_FROM_OF from Cython and the generated C code keeps crashing. Dag said on the Cython list that he wasn't sure what was going on, so maybe someone here will have an idea.

You must call import_array() at the top level before you can use any numpy C API functions.

http://wiki.cython.org/tutorials/numpy#UsingtheNumpyCAPI

Thanks. One more thing: calling Py_DECREF on arrays that I have acquired from PyArray_FROM_OF seems to cause crashes, am I correct in assuming that Cython is somehow tracking all the PyObjects in the scope (even ones acquired via the NumPy C API) and DECREF'ing it for me? David

David Warde-Farley wrote:

On 8-Oct-09, at 6:47 PM, Robert Kern wrote:

...

On Thu, Oct 8, 2009 at 17:28, David Warde-Farley wrote:

...

I'm trying to use PyArray_FROM_OF from Cython and the generated C code keeps crashing. Dag said on the Cython list that he wasn't sure what was going on, so maybe someone here will have an idea. You must call import_array() at the top level before you can use any numpy C API functions.

http://wiki.cython.org/tutorials/numpy#UsingtheNumpyCAPI

Thanks. One more thing: calling Py_DECREF on arrays that I have acquired from PyArray_FROM_OF seems to cause crashes, am I correct in assuming that Cython is somehow tracking all the PyObjects in the scope (even ones acquired via the NumPy C API) and DECREF'ing it for me?

If the function is declared with "object" as return type (or nothing which defaults to the same thing), then Cython will interpret that as the function handing away the reference of the object and make sure it is decref-ed. -- Dag Sverre