[Numpy-discussion] ufunc oddities

Charles R Harris charlesr.harris@gmail....
Sat May 24 22:15:55 CDT 2008


On Sat, May 24, 2008 at 9:11 PM, Robert Kern <robert.kern@gmail.com> wrote:

> On Sat, May 24, 2008 at 10:06 PM, Robert Kern <robert.kern@gmail.com>
> wrote:
> > On Sat, May 24, 2008 at 10:02 PM, Charles R Harris
> > <charlesr.harris@gmail.com> wrote:
> >> So what about the rule that the array type takes precedence over the
> scalar
> >> 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
> inconsistency.
>

You are confusing promotion between kinds with promotion within kinds. So in
this view, bool is not an integer type.

Chuck
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