From: William Djaja Tjokroaminata <billtj@...>
Date: 2003-02-13T04:04:55+09:00
Subject: Re: Range#length?

ahoward <ahoward@fsl.noaa.gov> wrote:
> On Tue, 11 Feb 2003, Vraj Mohan wrote:

>> Yukihiro Matsumoto wrote:
>> > Hi,
>> >
>> > Do you think of a good name for it?  I'm glad to add a method if
>> > you have a good name.
>> >
>> > 							matz.
>> How about "last_member"?

> what would be the last_member of

> (0.0 ... 42.0) ??

Hi,

How about "sup" and "inf"?  Using '{}' notation for set, '()' for open
interval, and '[]' for closed internval, then

    {40, 41, 42}   .sup   >> 42
    (40.0, 42.0)   .sup   >> 42.0
    [40.0, 42.0]   .sup   >> 42.0

Regarding the "length" or "size" of a floating point range, I guess we can
decide which is more useful from programming point of view, whether to
return infinity (aleph one, actually, according to the Continuum
Hypothesis) or to return Range.sup - Range.inf (which is more in line with
the Measure Theory).

Regards,

Bill