[Numpy-discussion] ufunc oddities

Robert Kern robert.kern@gmail....
Sat May 24 22:11:03 CDT 2008


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.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
 -- Umberto Eco


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