Tutorial slides (PDF) - Clemson University

Python Interface in BLACS and ScaLAPACK
% Note that we choose to return Py_None, instead of empty array.
if ((b_locM == 0) | (b_locN == 0))
{
Py_DECREF(b_obj);
Py_RETURN_NONE;
}
PyObject* value = PyBuildValue("O",b_obj);
Py_DECREF(b_obj);
return value;
} % end of scalapack_redist
More information at:
https://trac.fysik.dtu.dk/projects/gpaw/browser/trunk/c/blacs.c