On Fri, Jan 19, 2018 at 6:41 AM, Charles R Harris <charlesr.har...@gmail.com > wrote:
> > > On Fri, Jan 19, 2018 at 3:30 AM, Matthew Brett <matthew.br...@gmail.com> > wrote: > >> Hi, >> >> Sorry for my confusion, but I noticed (as a result of the discussion >> here [1]) that np.rint and the fallback C function [2] seem to round >> to even. But - my impression was that C rint, by default, rounds down >> [3]. Is numpy rint not behaving the same way as the GNU C library >> rint? >> >> In [4]: np.rint(np.arange(0.5, 11)) >> Out[4]: array([ 0., 2., 2., 4., 4., 6., 6., 8., 8., 10., 10.]) >> >> In [5]: np.round(np.arange(0.5, 11)) >> Out[5]: array([ 0., 2., 2., 4., 4., 6., 6., 8., 8., 10., 10.]) >> > > The GNU C documentation says that rint "round(s) x to an integer value > according to the current rounding mode." The rounding mode is determined by > settings in the FPU control word. Numpy runs with it set to round to even, > although, IIRC, there is a bug on windows where the library is not setting > those bits correctly. > Round to even is also the Python default rounding mode. Chuck
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