On 2/17/06, Travis Oliphant <oliphant@[...].edu>  wrote:
>  ...
>  Perhaps what is going on is that
>  a += 10
>  is begin translated to
>  a = a + 10
>  rather than
>  add(a,10,a)
>  I'll have to look deeper to see why.

It is actually being translated to "a = add(a,10,a)" by virtue of
array_inplace_add supplied in the inplace_add slot.  Here is the
proof:

> >> a = array(0)
> >> a = b = array(0)
> >> a += 10
> >> b
array(10)
> >> a
10

Another way to explain it is to note that a += 10 is equivalent to "a
= a.__iadd__(10)" and a.__iadd__(10) is equivalent to "add(a, 10, a)".

This is not easy to fix because the real culprit is

> >> a = array(0)
> >> type(a) is type(a+a)
False

Maybe we can change ufunc logic so that when the output argument is
supplied it is returned without scalar conversion.


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