Yeah, you're right, you get empty. I mistyped.
The point is, if you follow the fill rules, you get domain error.
Henry Rich
On 12/15/2017 9:44 PM, Jimmy Gauvin wrote:
That's funny, I get an empty vector in J and APL for 5+''.
Getting a 5 might be usefull/interesting.
On Fri, Dec 15, 2017 at 8:05 PM, Henry Rich <[email protected]> wrote:
The current behavior was designed to make sure that
5 + ''
5
doesn't throw an error. This is a 55-year-old APL idiom.
Henry Rich
On 12/15/2017 7:03 PM, Raul Miller wrote:
I've been thinking about this, and I am slightly convinced.
That said, I would be interested in seeing a real example where this
matters.
Specifically: in this example you are getting an empty noun with a
rank lower than what you should otherwise expect.
That suggests one of two likely treatments:
(a) The unintended shape causes an error.
(b) The unintended shape gets treated as an empty result.
(If the programmer has been coding defensively (which is to say not
expecting deep understanding of the mechanisms of connected
components) then I do not see how your proposal changes the picture.)
It could of course - but that's why I'd like to see a real example.
(Of course, none of this is an excuse for not testing code against
boundary conditions.)
Thanks,
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