Re: formatOfMidpoint()
On 14 Feb 2012, at 16:32, Vincent Lefevre wrote:
> On 2012-02-11 20:57:40 -0800, Dan Zuras Intervals wrote:
>> Under those circumstances any answer for
>> midpoint(Empty) is as good as any other.
>> Or as bad. For if X = Empty what does
>> equation (22) mean?
>>
>> X \subset [m-r,m+r] (22)
>>
>> where m = midpoint(Empty) & r = radius(Empty)?
>>
>> It works for any midpoint but NaN. But it
>> fails for NaN.
>
> I think that Equation (22) should be considered only when it makes
> sense at Level 1, i.e. when the midpoint and radius are properly
> defined. For Empty, they aren't.
>
> And what's important is when things don't make sense, the results
> should carry this information (there may be some exceptions, though):
> Empty for intervals, NaN for point values.
I agree.
John Pryce