Hi All, I "fixed" ticket #754, but it leads to a ton of problems. The original discussion is here<http://thread.gmane.org/gmane.comp.python.numeric.general/21526/focus=21537>. The problems that arise come from conversion to different types. In [26]: a Out[26]: array([ Inf, -Inf, NaN, 0., 3., -3.]) In [27]: sign(a).astype(int) Out[27]: array([ 1, -1, -2147483648, 0, 1, -1]) In [28]: sign(a).astype(bool) Out[28]: array([ True, True, True, False, True, True], dtype=bool) In [29]: sign(a) Out[29]: array([ 1., -1., NaN, 0., 1., -1.]) In [30]: bool(NaN) Out[30]: True So there are problems with at minimum the following. 1) The way NaN is converted to bool. I think it should be False. 2) The way NaN is converted to int types. I think it should be 0. These problems show up in failing tests. I'm reverting the fix for now, but I wonder what we should do about these things. Chuck