On 2013-10-25, Mark Janssen <dreamingforw...@gmail.com> wrote: >>>>> OTOH why in particular would you want to initialise them with zeros? I >>>>> often initialise arrays to nan which is useful for debugging. >>> >>> Is this some kind of joke? What has this list become? >> >> It's a useful debugging technique to initialize memory to distinctive >> values that should never occur in real data. > > If you're doing this, you're doing something wrong.
Pardon me if I don't take your word for it. > Please give me the hex value for NaN so I can initialize with my > array. Seriously? You haven't discovered google and wikepedia yet? http://www.google.com/ http://en.wikipedia.org/ Assuming you're using IEEE-754, all 1's is a quiet NaN: http://en.wikipedia.org/wiki/IEEE_floating_point http://en.wikipedia.org/wiki/NaN If you want a signaling NaN you've got to change one of the bits (see the above links). IIRC, the Pascal language required that using unintialized variables caused an error. intializing FP values to a signalling NaN is a very convenient way to do that. -- Grant Edwards grant.b.edwards Yow! I'm also against at BODY-SURFING!! gmail.com -- https://mail.python.org/mailman/listinfo/python-list
