[Numpy-discussion] ufunc oddities
Charles R Harris
Sat May 24 22:15:55 CDT 2008
On Sat, May 24, 2008 at 9:11 PM, Robert Kern <email@example.com> wrote:
> On Sat, May 24, 2008 at 10:06 PM, Robert Kern <firstname.lastname@example.org>
> > On Sat, May 24, 2008 at 10:02 PM, Charles R Harris
> > <email@example.com> wrote:
> >> So what about the rule that the array type takes precedence over the
> >> type? That is broken for booleans.
> > Yes, and if it wasn't an intentional special case (I don't recall
> > discussing it on the list, but it might have been), then it's a bug
> > and suitable for changing. The other behaviors are intentional and
> > thus not suitable for changing.
> Nope, I'm wrong. I just doublechecked the manual. bool_ is separate
> from number on the tree of dtypes, so bool_ + int_ is a cross-kind
> operation and the scalarness of the int_ is not a concern. E.g.
> array([1, 2]) + 3.0 has similar behavior. This is not an
You are confusing promotion between kinds with promotion within kinds. So in
this view, bool is not an integer type.
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