On Mon, May 20, 2013 at 6:58 PM, Bakhtiyor Zokhidov <bakhtiyor_zokhi...@mail.ru> wrote: > ok... I think -0.0 is mathematically wrong but in a program it is true. > > What I suspect is that if -0.0 doesn't affect on result (e.g., 2*(-0.0 + 2) > or (-0.0-2)*2 ) . If it does not affect results it would be good for me
It doesn't affect those computations, no. It does have different results for division (1/-0.0 -> -inf), and it will often determine which branch gets evaluated for a complex function that has a branch point at the origin. These are usually considered good things and are the primary reason that floating point includes signed zeros. http://en.wikipedia.org/wiki/Signed_zero -- Robert Kern _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
