Hi, I've been lurking for a while, and using Numeric for about 5-6 months. I submitted a bug report about two months ago (https://sourceforge.net/tracker/index.php?func=detail&aid=594761&group_id=1369&atid=101369) regarding incorrect underflow behavior in exp(). I'd really like to get that fixed, nobody else seems to be working on it, and so I checked out the CVS tree. From reading the API section of the manual, I can see that unary ufuncs are driven by PyUFunc_FromFuncAndData() and that exp already has check_return set to 1, so that it should clean up rank-0 arrays, and raise the appropriate Python exception when 'errno' is set by a math error. I'd like to take a closer look into things, and one way of doing that would be to use a unit-test suite, but it's not obvious where that is (if at all) in the source distribution. Is there one? Another way to look into it would be if I could write some C code, then drop into Numeric's code and track what's going on when I call exp() for arguments that underflow. Is there a harness out there that I could just adapt to my own needs. Surely that's how other developers do it. If not, how *do* you fix bugs? I've already added some features to JNumeric, and introduced a unit-test suite there. I have so few problems using Numeric, I'd really like to nail this one involving exp(), since it's holding me back. Thanks, -Frank Gibbons PhD, Computational Biologist, Harvard Medical School BCMP/SGM-322, 250 Longwood Ave, Boston MA 02115, USA. Tel: 617-432-3555 Fax: 617-432-3557 http://llama.med.harvard.edu/~fgibbons