On Fri, Jul 10, 2009 at 1:00 PM, Daniel Lyons<fus...@storytotell.org> wrote:
>
>
> On Jul 10, 2009, at 12:24 PM, Sean Devlin wrote:
>
>>
>> A quick java program:
>>
>> public static void main(String[] args) {
>> System.out.println(1.0/0.0);
>> }
>>
>> Infinity
>>
>>
>> On Jul 10, 11:08 am, John Harrop <jharrop...@gmail.com> wrote:
>>> This is odd:
>>> user=> (/ 1.0 0.0)
>>> #<CompilerException java.lang.ArithmeticException: Divide by zero
>>> (NO_SOURCE_FILE:0)>
>>>
>>> Shouldn't it be Double/POSITIVE_INFINITY?
>
> I think there's still room for an argument here, if anyone wants to
> have one.
>
> http://scienceblogs.com/goodmath/2008/10/infinity_is_not_a_number.php
>
> I'm not convinced that x/0 is arithmetically infinity thanks to Mark's
> blog post there and it sure bugs me when I do something stupid and get
> Infinity back instead of an error. It's like a timebomb in my code,
> concealing where the real mistake was. I do like having the constant
> there for doing algorithms that depend on it (Dijkstra's SSSP comes to
> mind) but I think x/0 is an error (unless it's 0/0).
>
> —
> Daniel Lyons
>
>
> >
>
using math knowledge to answer (corner) cases of the floating point
spec is silly
people using doubles should be able to expect doubles to behave like doubles
--
And what is good, Phaedrus,
And what is not good—
Need we ask anyone to tell us these things?
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