On Fr, 2016-10-07 at 19:12 -0600, Charles R Harris wrote: > Hi All, > > The time for NumPy 1.12.0 approaches and I like to have a final > decision on the treatment of integers to negative integer powers with > the `**` operator. The two alternatives looked to be > > Raise an error for arrays and numpy scalars, including 1 and -1 to > negative powers. >
For what its worth, I still feel it is probably the only real option to go with error, changing to float may have weird effects. Which does not mean it is impossible, I admit, though I would like some data on how downstream would handle it. Also would we need an int power? The fpower seems more straight forward/common pattern. If errors turned out annoying in some cases, a seterr might be plausible too (as well as a deprecation). - Sebastian > Pluses > Backward compatible > Allows common powers to be integer, e.g., arange(3)**2 > Consistent with inplace operators > Fixes current wrong behavior. > Preserves type > > Minuses > Integer overflow > Computational inconvenience > Inconsistent with Python integers > > Always return a float > > Pluses > Computational convenience > > Minuses > Loss of type > Possible backward incompatibilities > Not applicable to inplace operators > > > Thoughts? > > Chuck > > > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@scipy.org > https://mail.scipy.org/mailman/listinfo/numpy-discussion
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