Am 24.09.2011 04:40, schrieb Guido van Rossum: > On Fri, Sep 23, 2011 at 7:13 PM, Steven D'Aprano <st...@pearwood.info> wrote: >>>> http://code.activestate.com/recipes/577068-floating-point-range/ >>> >>> I notice that your examples carefully skirt around the rounding issues. >> >> I also carefully *didn't* claim that it made rounding issues disappear >> completely. I'll add a note clarifying that rounding still occurs and as a >> consequence results can be unexpected. > > I believe this API is fundamentally wrong for float ranges, even if > it's great for int ranges, and I will fight against adding it to the > stdlib in that form. > > Maybe we can come up with a better API, and e.g. specify begin and end > points and the number of subdivisions? E.g. frange(0.0, 2.1, 3) would > generate [0.0, 0.7, 1.4].
This is what numpy calls linspace: http://docs.scipy.org/doc/numpy/reference/generated/numpy.linspace.html numpy also has an "arange" that works with floats, but: """When using a non-integer step, such as 0.1, the results will often not be consistent. It is better to use linspace for these cases.""" Georg _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
