Hi all, I have moved the generalised ufuncs functionality off to a branch: http://svn.scipy.org/svn/numpy/branches/gen_ufuncs Please try it out and give us your feedback. We shall also pound on it at the sprint during SciPy'08, and thereafter decide how and when to best integrate it into NumPy. Thanks to Wenjie Fu and Hans-Andreas Engel for taking the time to think this issue through and to submit such a high-quality patch. Regards Stéfan