On Fri, Dec 6, 2013 at 1:16 PM, Alan G Isaac <alan.is...@gmail.com> wrote: > On 12/6/2013 12:23 PM, Alexander Belopolsky wrote: >> What is the rationale for this: >> >> >>> -array(True) + array(True) >> True > > > The minus is complementation. > So you are just writing > False or True
unary versus binary minus >>> m1 + (-m2) array([False, False, True, True, True], dtype=bool) >>> m1 - m2 array([ True, True, False, False, True], dtype=bool) >>> -m2 + m1 array([False, False, True, True, True], dtype=bool) >>> m1 - (-m2) array([False, False, True, True, False], dtype=bool) I'd rather write ~ than unary - if that's what it is. Josef > > Alan Isaac > > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@scipy.org > http://mail.scipy.org/mailman/listinfo/numpy-discussion _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
